docs: Sphinx documentation fixes

Broken links, invalid chapter underlining, invalid code fragments, etc.

docs/examples/basics/glide_computer.rst

@@ -16,7 +16,7 @@ This example presents the usage of:
 .. literalinclude:: ../../../example/glide_computer/include/glide_computer.h
   :caption: glide_computer.h
   :start-at: #include
-  :end-before: using namespace units;
+  :end-at: // - flight path exactly on a shortest possible line to destination
   :linenos:
   :lineno-match:
 
@@ -37,7 +37,7 @@ For example we have 3 for a quantity of length:
 
 .. literalinclude:: ../../../example/glide_computer/include/glide_computer.h
   :caption: glide_computer.h
-  :start-at: using namespace units;
+  :start-after: // - flight path exactly on a shortest possible line to destination
   :end-before: // text output
   :linenos:
   :lineno-match:

docs/examples/kalman_filter/example_7.rst

@@ -1,5 +1,5 @@
 Example 7 - Estimating the temperature of the heating liquid I
-=============================================================
+==============================================================
 
 Implementation of: https://www.kalmanfilter.net/kalman1d.html#ex7
 

docs/examples/kalman_filter/example_8.rst

@@ -1,5 +1,5 @@
 Example 8 - Estimating the temperature of the heating liquid II
-==============================================================
+===============================================================
 
 Implementation of: https://www.kalmanfilter.net/kalman1d.html#ex8