Fix build of pg_verify_checksum docs

They were accidentally excluded when reverting the backend online
checksum functionality, and since they weren't built the incorrect
reference to a removed section also did not trigger a problem.

Author: Christoph Berg

Author: mhagander

doc/src/sgml/ref/pg_verify_checksums.sgml

@@ -93,12 +93,4 @@ PostgreSQL documentation
   </para>
  </refsect1>
 
- <refsect1>
-  <title>See Also</title>
-
-  <simplelist type="inline">
-   <member><xref linkend="checksums"/></member>
-  </simplelist>
- </refsect1>
-
 </refentry>

doc/src/sgml/reference.sgml

@@ -255,6 +255,7 @@
    &pgReceivewal;
    &pgRecvlogical;
    &pgRestore;
+   &pgVerifyChecksums;
    &psqlRef;
    &reindexdb;
    &vacuumdb;