Updated some descriptive text.

docs/source/comparisons_analytical.rst

@@ -2,7 +2,7 @@
 Analytical comparisons
 **********************
 
-This section presents comparisons between analytical and modelled solutions.
+This section presents comparisons between analytical solutions and modelled solutions using gprMax.
 
 Hertzian dipole in free space
 =============================

docs/source/comparisons_numerical.rst

@@ -2,7 +2,7 @@
 Numerical comparisons
 *********************
 
-This section presents some comparisons of models using different numerical modelling techniques.
+This section presents comparisons of models using different numerical modelling techniques.
 
 FDTD/MoM
 ========