Update several @since comments
|Reported by:||dgwyer||Owned by:||ryan|
Update several @since 3.3 comments to be @since 3.3.0.
There are 75 @since 3.3.0 entries and 8 @since 3.3, so it makes sense to update the 8 entries for consistency.
Leaving these as they are causes a minor issue when searching for @since 3.3.0, as any @since 3.3 entries won't be included in the search results.