Improve addon-info README options documentation

[tenshiemi]

Added more info about options available since it was confusing

[codecov]

Codecov Report

Merging #1732 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1732   +/-   ##
=======================================
  Coverage   21.18%   21.18%           
=======================================
  Files         252      252           
  Lines        5694     5694           
  Branches      679      692   +13     
=======================================
  Hits         1206     1206           
+ Misses       3979     3946   -33     
- Partials      509      542   +33

Impacted Files	Coverage Δ
app/react/src/server/utils.js	0% <0%> (-32.15%)	⬇️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	43.15% <0%> (ø)	⬆️
addons/knobs/src/KnobManager.js	32% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/layout.js	12.5% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	28.57% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
... and 22 more

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[usulpro]

@tenshiemi, thank you for pointing us to this lack of documentation!

There're some more options:
source, propTables, propTablesExclude, styles

Could you also add them if you want? otherwise, we'll do it ourselves

[ndelangen]

Hi @tenshiemi Sorry about the confusion, but thank you so much for taking the time to make a PR, to improve!

Truly appreciated! Do you want to take a look at @usulpro's comments, that'd be fantastic. If you're stretched on time, that's fine, we can merge as is, and @usulpro will add it, I think.

[usulpro]

I was going to do big update of addon-info readme in #1501, but I want to use this PR as a good chance to make it relevant to the current state and possible future updates

So I just add some additional notes