fix: add mailtrigger links

[IurmanJ]

Replace text by link for a trigger when displayed.
Do the same for a recipient.

Fixes #3886

[codecov]

Codecov Report

Merging #4243 (7802a38) into main (fe1f51a) will decrease coverage by 0.00%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##             main    #4243      +/-   ##
==========================================
- Coverage   88.40%   88.40%   -0.01%     
==========================================
  Files         294      294              
  Lines       39197    39202       +5     
==========================================
+ Hits        34652    34656       +4     
- Misses       4545     4546       +1     

Impacted Files	Coverage Δ
ietf/doc/urls.py	100.00% <ø> (ø)
ietf/utils/markdown.py	100.00% <ø> (ø)
ietf/doc/views_draft.py	91.98% <93.75%> (ø)
ietf/doc/views_doc.py	90.52% <100.00%> (+0.02%)	⬆️
ietf/utils/text.py	85.97% <100.00%> (+0.26%)	⬆️
ietf/doc/templatetags/ietf_filters.py	87.14% <0.00%> (-0.24%)	⬇️

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