Fix incorrect UUID index entry in function documentation - Mailing list pgsql-docs

Hi,

Both the UUID data type and UUID functions pages define an index entry
for "UUID" that points to the data type section. As a result, the index
includes two identical entries linking to the UUID type docs,
which seems strange.

I believe the UUID functions page should instead define its own index
entry that links to itself. Currently, the indexterm is written as:

--------------------
  <sect1 id="functions-uuid">
   <title>UUID Functions</title>

   <indexterm zone="datatype-uuid">
    <primary>UUID</primary>
    <secondary>generating</secondary>
   </indexterm>
--------------------

I suspect that "datatype-uuid" is a copy-paste error and should be
"functions-uuid" to reflect the correct section. The attached patch
updates this accordingly.

Thoughts?

Regards,

-- 
Fujii Masao
NTT DATA Japan Corporation