[6.0] Trim XML documentation for reference project + fix Note tags (#3233)

[cheenamalhotra]

Ports #3233 to release/6.0 branch

1 conflict was resolved in SqlConnection.xml due to new changes in main over 6.0 branch. Ofher than that, it's a direct port.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.69%. Comparing base (cfb007d) to head (8fa6434).
Report is 6 commits behind head on release/6.0.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/6.0    #3278      +/-   ##
===============================================
- Coverage        72.78%   72.69%   -0.10%     
===============================================
  Files              285      285              
  Lines            59162    59162              
===============================================
- Hits             43064    43005      -59     
- Misses           16098    16157      +59     

Flag	Coverage Δ
addons	92.58% <ø> (ø)
netcore	75.53% <ø> (-0.01%)	⬇️
netfx	71.01% <ø> (-0.15%)	⬇️

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