fix(dynamite): Add missing docs about request body

[provokateurin]

Fixes #2240

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 30.99%. Comparing base (2d8d0d3) to head (1be3744).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2269      +/-   ##
==========================================
+ Coverage   30.20%   30.99%   +0.79%     
==========================================
  Files         262      263       +1     
  Lines       96598    97093     +495     
==========================================
+ Hits        29177    30094     +917     
+ Misses      67421    66999     -422     

Flag	Coverage Δ		*Carryforward flag
cookie_store	90.51% <ø> (ø)		Carriedforward from a9b3ead
dynamite	31.08% <0.00%> (-0.03%)	⬇️
dynamite_end_to_end_test	60.96% <ø> (+0.92%)	⬆️
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from a9b3ead
neon_dashboard	96.20% <ø> (ø)
neon_framework	44.60% <ø> (ø)
neon_notifications	100.00% <ø> (ø)
neon_talk	98.94% <ø> (ø)
nextcloud	27.67% <ø> (+0.70%)	⬆️
sort_box	90.90% <ø> (ø)		Carriedforward from a9b3ead

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
...ckages/nextcloud/lib/src/api/cookbook.openapi.dart	95.45% <ø> (ø)
...ite/dynamite/lib/src/models/openapi/operation.dart	2.43% <0.00%> (-0.13%)	⬇️

... and 8 files with indirect coverage changes