Form documentation updates (SYN-3890)

[vEpiphyte]

• Make the form properties into a table instead of a list.
• Add light edge projection to forms.

[codecov]

Codecov Report

Patch coverage: 97.70% and project coverage change: -0.10% ⚠️

Comparison is base (e1c0b01) 97.26% compared to head (2e60ca0) 97.16%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3348      +/-   ##
==========================================
- Coverage   97.26%   97.16%   -0.10%     
==========================================
  Files         228      228              
  Lines       46397    46500     +103     
==========================================
+ Hits        45128    45182      +54     
- Misses       1269     1318      +49     

Flag	Coverage Δ
linux	97.16% <97.70%> (-0.01%)	⬇️
linux_replay	?

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Files Changed	Coverage Δ
synapse/tools/autodoc.py	97.43% <97.70%> (-0.08%)	⬇️

... and 9 files with indirect coverage changes

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