fix: Add "add comment" feature to the review requests.

[kivinen]

Fixes #5979. Add missing tbody/tbody to review_request.html.

[codecov]

Codecov Report

Merging #6603 (6c0cb4d) into main (d246879) will increase coverage by 0.01%.
Report is 2 commits behind head on main.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##             main    #6603      +/-   ##
==========================================
+ Coverage   88.85%   88.86%   +0.01%     
==========================================
  Files         284      284              
  Lines       40253    40275      +22     
==========================================
+ Hits        35765    35790      +25     
+ Misses       4488     4485       -3     

Files	Coverage Δ
ietf/doc/urls_review.py	100.00% <ø> (ø)
ietf/review/models.py	92.85% <100.00%> (+0.88%)	⬆️
ietf/doc/views_review.py	95.14% <94.73%> (-0.02%)	⬇️

... and 3 files with indirect coverage changes