Dmitry Gozman c68f57d2d0
docs: mark optional properties/arguments explicitly with "?" (#13369)
Previously, we were guessing whether something is optional from the
comment (looking for stuff like "defaults to" or "optional").

To remove this error-prone technique, every optional property or
argument (but not option) is explicitly marked with "?".
2022-04-06 19:02:10 -07:00
..