fix: display the agenda warning note more prominently

[jennifer-richards]

Fixes #4123

[codecov]

Codecov Report

Merging #4124 (0749470) into main (7fc601e) will increase coverage by 0.06%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main    #4124      +/-   ##
==========================================
+ Coverage   88.14%   88.21%   +0.06%     
==========================================
  Files         297      295       -2     
  Lines       39275    39164     -111     
==========================================
- Hits        34619    34548      -71     
+ Misses       4656     4616      -40     

Impacted Files	Coverage Δ
ietf/api/urls.py	100.00% <ø> (ø)
ietf/group/models.py	93.28% <ø> (+0.60%)	⬆️
ietf/ietfauth/views.py	90.75% <ø> (ø)
ietf/meeting/models.py	86.60% <ø> (-0.04%)	⬇️
ietf/nomcom/utils.py	91.39% <40.00%> (-0.73%)	⬇️
ietf/api/views.py	89.06% <80.00%> (-0.42%)	⬇️
ietf/stats/utils.py	53.44% <82.35%> (-0.10%)	⬇️
ietf/doc/templatetags/ballot_icon.py	84.72% <90.90%> (ø)
ietf/meeting/views.py	91.13% <93.75%> (+0.02%)	⬆️
ietf/doc/templatetags/ietf_filters.py	87.71% <100.00%> (+2.45%)	⬆️
... and 19 more

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