jsduck: Add @inheritable to static methods from jQuery plugins

Follows-up aa34a71, 28ae883. Forgot to add @inheritable in a few,
which is necessary for static methods as they aren't inherited by
default and thus wouldn't be mixed into jQuery (from jQuery.plugin).

Change-Id: I893103e90ac9becca721333a931a0bd53f193f6e
Merge "jsduck: Add @inheritable to static methods from jQuery plugins"