docs: update example source lines

docs/users_guide/examples/avg_speed.md

@@ -18,28 +18,28 @@ First, we include all the necessary header files and import all the identifiers
 `mp_units` namespace:
 
 ```cpp title="avg_speed.cpp" linenums="1"
---8<-- "example/avg_speed.cpp:28:38"
+--8<-- "example/avg_speed.cpp:28:42"
 ```
 
 Next, we define two functions calculating average speed based on quantities of fixed units
 and integral and floating-point representation types, respectively, and a third function
 that we introduced in the [previous example](hello_units.md):
 
-```cpp title="avg_speed.cpp" linenums="12"
---8<-- "example/avg_speed.cpp:40:54"
+```cpp title="avg_speed.cpp" linenums="16"
+--8<-- "example/avg_speed.cpp:44:58"
 ```
 
 We also added a simple utility to print our results:
 
-```cpp title="avg_speed.cpp" linenums="27"
---8<-- "example/avg_speed.cpp:56:62"
+```cpp title="avg_speed.cpp" linenums="31"
+--8<-- "example/avg_speed.cpp:60:66"
 ```
 
 Now, let's analyze how those three utility functions behave with different sets of arguments.
 First, we are going to use quantities of SI units and integral representation:
 
-```cpp title="avg_speed.cpp" linenums="27"
---8<-- "example/avg_speed.cpp:64:78"
+```cpp title="avg_speed.cpp" linenums="38"
+--8<-- "example/avg_speed.cpp:68:82"
 ```
 
 The above provides the following output:
@@ -61,8 +61,8 @@ can be easily observed in the first case where we deal with integral representat
 The second scenario is really similar to the previous one, but this time, function arguments
 have floating-point representation types:
 
-```cpp title="avg_speed.cpp" linenums="42"
---8<-- "example/avg_speed.cpp:80:91"
+```cpp title="avg_speed.cpp" linenums="53"
+--8<-- "example/avg_speed.cpp:84:95"
 ```
 
 Conversion from floating-point to integral representation types is
@@ -82,8 +82,8 @@ Average speed of a car that makes 220 km in 2 h is 110 km/h.
 Next, let's do the same for integral and floating-point representations, but this time
 using US Customary units:
 
-```cpp title="avg_speed.cpp" linenums="54"
---8<-- "example/avg_speed.cpp:93:124"
+```cpp title="avg_speed.cpp" linenums="65"
+--8<-- "example/avg_speed.cpp:97:129"
 ```
 
 One important difference here is the fact that as it is not possible to make a lossless conversion
@@ -108,8 +108,8 @@ Please note how the first and third results get truncated using integral represe
 
 In the end, we repeat the scenario for CGS units:
 
-```cpp title="avg_speed.cpp" linenums="86"
---8<-- "example/avg_speed.cpp:126:155"
+```cpp title="avg_speed.cpp" linenums="98"
+--8<-- "example/avg_speed.cpp:131:161"
 ```
 
 Again, we observe `value_cast` being used in the same places and consistent truncation errors
@@ -129,6 +129,6 @@ Average speed of a car that makes 2.2e+07 cm in 7200 s is 110 km/h.
 
 The example file ends with a simple `main()` function:
 
-```cpp title="avg_speed.cpp" linenums="116"
---8<-- "example/avg_speed.cpp:157:"
+```cpp title="avg_speed.cpp" linenums="129"
+--8<-- "example/avg_speed.cpp:163:"
 ```

docs/users_guide/examples/hello_units.md

@@ -18,20 +18,20 @@ First, we include the headers for:
 - text and stream output support
 
 ```cpp title="hello_units.cpp" linenums="1"
---8<-- "example/hello_units.cpp:28:33"
+--8<-- "example/hello_units.cpp:28:39"
 ```
 
 Also, to shorten the definitions, we "import" `mp_units` namespace.
 
-```cpp title="hello_units.cpp" linenums="7"
---8<-- "example/hello_units.cpp:35:36"
+```cpp title="hello_units.cpp" linenums="12"
+--8<-- "example/hello_units.cpp:40:41"
 ```
 
 Next we define a simple function that calculates average speed based on the provided
 arguments of length and time:
 
-```cpp title="hello_units.cpp" linenums="8"
---8<-- "example/hello_units.cpp:37:40"
+```cpp title="hello_units.cpp" linenums="13"
+--8<-- "example/hello_units.cpp:42:45"
 ```
 
 The above function template takes any quantities implicitly convertible to `isq::length`
@@ -45,16 +45,16 @@ that its quantity type is implicitly convertible to `isq::speed`.
     type is really useful for users of such a function as it provides more information
     of what to expect from a function than just using `auto`.
 
-```cpp title="hello_units.cpp" linenums="12"
---8<-- "example/hello_units.cpp:42:45"
+```cpp title="hello_units.cpp" linenums="17"
+--8<-- "example/hello_units.cpp:47:50"
 ```
 
 The above lines explicitly opt-in to use unit symbols from two systems of units.
 As this introduces a lot of short identifiers into the current scope, it is not done
 implicitly while including a header file.
 
-```cpp title="hello_units.cpp" linenums="16"
---8<-- "example/hello_units.cpp:47:53"
+```cpp title="hello_units.cpp" linenums="21"
+--8<-- "example/hello_units.cpp:52:58"
 ```
 
 - Lines `16` & `17` create a quantity of kind `isq::length / isq::time` with the numbers
@@ -74,8 +74,8 @@ implicitly while including a header file.
 - Line `22` does a [value-truncating conversion](../framework_basics/value_conversions.md#value-truncating-conversions)
   of changing the underlying representation type from `double` to `int`.
 
-```cpp title="hello_units.cpp" linenums="23"
---8<-- "example/hello_units.cpp:55"
+```cpp title="hello_units.cpp" linenums="28"
+--8<-- "example/hello_units.cpp:60"
 ```
 
 The above presents [various ways to print a quantity](../framework_basics/text_output.md).

docs/users_guide/examples/si_constants.md

@@ -13,7 +13,7 @@ how [Faster-than-lightspeed Constants](../framework_basics/faster_than_lightspee
 work in practice.
 
 ```cpp title="si_constants.cpp" linenums="1"
---8<-- "example/si_constants.cpp:28:34"
+--8<-- "example/si_constants.cpp:28:39"
 ```
 
 As always, we start with the inclusion of all the needed header files. After that, for
@@ -21,8 +21,8 @@ the simplicity of this example, we
 [hack the character of quantities](../framework_basics/character_of_a_quantity.md#hacking-the-character)
 to be able to express vector quantities with simple scalar types.
 
-```cpp title="si_constants.cpp" linenums="1"
---8<-- "example/si_constants.cpp:36:"
+```cpp title="si_constants.cpp" linenums="13"
+--8<-- "example/si_constants.cpp:41:"
 ```
 
 The main part of the example prints all of the SI-defining constants. While analyzing the output of