Corrected some more spelling and grammatical mistakes in different files of docs.

docs/source/examples_advanced.rst

@@ -52,7 +52,7 @@ High dielectric example
 
 :download:`cylinder_fs.py <../../examples/subgrids/cylinder_fs.py>`
 
-This example is a basic demonstration of how to use subgrids. The geometry is 3D (required for any use of subgrids) and is of a water-filled (high dielectric constant) cylindrical object in freespace. The subgrid encloses the cylinderical object using a fine spatial discretisation (1mm), and a courser spatial discretisation (5mm) is used in the rest of the model (main grid). A simple Hertzian dipole source is used with a waveform shaped as the first derivative of a gaussian.
+This example is a basic demonstration of how to use subgrids. The geometry is 3D (required for any use of subgrids) and is of a water-filled (high dielectric constant) cylindrical object in freespace. The subgrid encloses the cylindrical object using a fine spatial discretisation (1mm), and a courser spatial discretisation (5mm) is used in the rest of the model (main grid). A simple Hertzian dipole source is used with a waveform shaped as the first derivative of a gaussian.
 
 .. literalinclude:: ../../examples/subgrids/cylinder_fs.py
     :language: none