Rearrange documentation paragraph describing pg_relation_size().
Rearrange documentation paragraph describing pg_relation_size().

Break the list of available options into an <itemizedlist> instead of
inline sentences.  This is mostly motivated by wanting to ensure that the
cross-references to the FSM and VM docs don't cross page boundaries in PDF
format; but it seems to me to read more easily this way anyway.  I took the
liberty of editorializing a bit further while at it.

Per complaint from Magnus about 9.0.18 docs not building in A4 format.
Patch all active branches so we don't get blind-sided by this particular
issue again in future.

Postgres-XL/Postgres-XL,yazun/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,adam8157/gpdb,xinzweb/gpdb,lisakowen/gpdb,50wu/gpdb,adam8157/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,lisakowen/gpdb,xinzweb/gpdb,oberstet/postgres-xl,ovr/postgres-xl,adam8157/gpdb,lisakowen/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lisakowen/gpdb,ashwinstar/gpdb,lisakowen/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,zeroae/postgres-xl,50wu/gpdb,50wu/gpdb,xinzweb/gpdb,zeroae/postgres-xl,xinzweb/gpdb,50wu/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,jmcatamney/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,lisakowen/gpdb,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,ovr/postgres-xl,jmcatamney/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,techdragon/Postgres-XL,jmcatamney/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,yazun/postgres-xl,pavanvd/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,jmcatamney/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,techdragon/Postgres-XL,ovr/postgres-xl,yazun/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,zeroae/postgres-xl,pavanvd/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,50wu/gpdb,zeroae/postgres-xl