[#73270920]add "supported controls"

some tweaks of styles are done in "_forms.scss"
- these tweaks is about form elements
Merge branch '73270954editable-text' into 73270920supported-controls
Merge branch '73270954editable-text' into 73270920supported-controls
Merge branch 'master' into 73270920supported-controls
typo in scss
Merge pull request #30 from gengo/73270920supported-controls

[#73270920] supported controls