Change titles to sentence case

[PipKat]

I also fixed other Google style guide violations that I saw while skimming the file content. Most of these changes were removing future tense and double spaces between sentences. Content reviewed so far includes that in the Getting Started section and half of the User Guide section.

[github-actions]

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• BUG
• NEW FEATURE
• Enhancement
• Documentation
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[codecov]

Codecov Report

Merging #1561 (b548890) into main (19173b6) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1561      +/-   ##
==========================================
- Coverage   82.12%   82.02%   -0.11%     
==========================================
  Files          43       43              
  Lines        6803     6803              
==========================================
- Hits         5587     5580       -7     
- Misses       1216     1223       +7     

[germa89]

LGTM.

Btw, it is so obvious I wrote the WSL guide.

[germa89]

Btw @PipKat , since it seems you are going to read the whole docs, I would like to remind you that if you see any reference to a method, function or attribute I would like to format them as: :func:`function<ansys.mapdl.core.function>` .

Just ping me to add them, by commenting in the review.

Thank you again!! :)