[1.x] Add abstracts to the documentation pages

[emmadesilva]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0159a94) to head (643e8fb).
⚠️ Report is 6 commits behind head on 1.x.

Additional details and impacted files

@@             Coverage Diff             @@
##                 1.x     #2521   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1775      1775           
===========================================
  Files            183       183           
  Lines           4786      4736   -50     
===========================================
- Hits            4786      4736   -50     

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