docs: Documentation now prefers refrences over UDLs

docs/use_cases/linear_algebra.rst

@@ -27,9 +27,9 @@ The official :term:`quantity` definition states:
 
 So the most common use case would be to create a vector or matrix of quantities::
 
-    fs_vector<si::length<si::metre>, 3> v = { 1_q_m, 2_q_m, 3_q_m };
-    fs_vector<si::length<si::metre>, 3> u = { 3_q_m, 2_q_m, 1_q_m };
-    fs_vector<si::length<si::kilometre>, 3> t = { 3_q_km, 2_q_km, 1_q_km };
+    fs_vector<si::length<si::metre>, 3> v = { 1 * m, 2 * m, 3 * m };
+    fs_vector<si::length<si::metre>, 3> u = { 3 * m, 2 * m, 1 * m };
+    fs_vector<si::length<si::kilometre>, 3> t = { 3 * km, 2 * km, 1 * km };
 
 Having such definitions we can perform full dimensional analysis operations for the operations
 allowed by the Linear Algebra rules. For example::
@@ -38,7 +38,7 @@ allowed by the Linear Algebra rules. For example::
     std::cout << "v + t     = " << v + t << "\n";
     std::cout << "t[m]      = " << fs_vector<si::length<si::metre>, 3>(t) << "\n";
     std::cout << "v * u     = " << v * u << "\n";
-    std::cout << "2_q_m * v = " << 2_q_m * v << "\n";
+    std::cout << "2 * m * v = " << 2 * m * v << "\n";
 
 The above code works as expected and produces the following output:
 
@@ -48,7 +48,7 @@ The above code works as expected and produces the following output:
     v + t     = |    3001 m    2002 m    1003 m |
     t[m]      = |    3000 m    2000 m    1000 m |
     v * u     = 10 m²
-    2_q_m * v = |     2 m²     4 m²     6 m² |
+    2 * m * v = |     2 m²     4 m²     6 m² |
 
 
 Quantities of Linear Algebra Types
@@ -79,7 +79,7 @@ output:
     v + t     = |      3001      2002      1003 | m
     t[m]      = |      3000      2000      1000 | m
     v * u     = 10 m²
-    2_q_m * v = |         2         4         6 | m²
+    2 * m * v = |         2         4         6 | m²
 
 
 .. seealso::