[docs] Add new things to .rst files

[johnkerl]

Issue and/or context: This is one step in #3282. There is more work to do on #3282.

Changes:

I added new things to manually curated .rst files within doc/.

Notes for Reviewer:

PR stacking as of today:

• main
• [docs] Add new things to .rst files #3283
• [docs] Fix Sphinx issue with linkless summaries #3284
• [python] Doc updates for new-shape feature #3285

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.78%. Comparing base (5f154bf) to head (4b03901).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3283      +/-   ##
==========================================
+ Coverage   83.67%   83.78%   +0.10%     
==========================================
  Files          51       51              
  Lines        5556     5556              
==========================================
+ Hits         4649     4655       +6     
+ Misses        907      901       -6     

Flag	Coverage Δ
python	83.78% <ø> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
python_api	83.78% <ø> (+0.10%)	⬆️
libtiledbsoma	∅ <ø> (∅)