Add quotes and don't include 'version_added' if there's no 'since' info

Also remove now-unecessary 'no-toggle' class from left nav items.

bug: b/70844489

test: make ds-docs

Change-Id: I88cc7cde9de1871fd5abdf2fae94dfb5e47912b7
Merged-In: I88cc7cde9de1871fd5abdf2fae94dfb5e47912b7
2 files changed