* lisp/font-lock.el (font-lock-keywords): Tweak doc string
slightly (bug#35005).
SUBEXP is the number of the subexpression of MATCHER to be
highlighted.
-FACENAME is an expression whose value is the face name to use.
+FACENAME is an expression whose value is the face to use.
Instead of a face, FACENAME can evaluate to a property list of
the form (face FACE PROP1 VAL1 PROP2 VAL2 ...) in which case all
the listed text-properties will be set rather than just FACE. In