PyMAPDL doc doesn't follow the Google dev doc style guide in many respects

[germa89]

Hi, @germa89. The PyMAPDL doc doesn't follow the Google dev doc style guide in many respects (such as subject case titles) because it never went through a doc review as it was already public. As a result, I'm just going to comment on non-style suggestions.

Originally posted by @PipKat in #4127 (comment)