Updated files in how to and index folders based on AA feedback

[Andriciuc]

• Reorganized Uninstall, added warning note and added a new step to ensure user knows he needs to decrypt or drop encrypted tables
• Updated table access ALTER SYSTEM command do be easier to read
• updated limitations, removed rewind mention and added WAL note as text, made small changes to RC version. Added note for KMS, improved system tables text.

Multi-tenant-setup.md:

• updated SELECT parameters
• Added that KMIP server setup is out of scope.
• Added a link to KMS configuration chapter in the intro to Key provider config

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-17.5.2@8b1f1cf). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release-17.5.2     #444   +/-   ##
=================================================
  Coverage                  ?   84.69%           
=================================================
  Files                     ?       21           
  Lines                     ?     2594           
  Branches                  ?      402           
=================================================
  Hits                      ?     2197           
  Misses                    ?      316           
  Partials                  ?       81           

Components	Coverage Δ
access	81.11% <0.00%> (?)
catalog	88.22% <0.00%> (?)
common	77.77% <0.00%> (?)
encryption	73.45% <0.00%> (?)
keyring	72.88% <0.00%> (?)
src	91.54% <0.00%> (?)
smgr	94.88% <0.00%> (?)
transam	∅ <0.00%> (?)

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