I have made the changes requested and one other:

 - added a NEWS entry

 - find-function-search-for-symbol doc string additions
   trimmed of detail that is available from the manual.

 - in the manual, added an index entry for the new property,
   definition-type, and for all the existing properties that
   did not have index entries (which was most of them).

 - in the code example, put each top-level form in @group.

 - new in this version of the patch: added a cross reference
   from where Coding Conventions discusses how to write macros
   that define functions.