* vacuumdb - add missing equal signs =

* CREATE/ALTER/DROP COLLATION. Adds new references for these commands.

* ALTER CONVERSION. Add SET SCHEMA variant.

* ALTER OPERATOR. add SET SCHEMA.

* ALTER OPERATOR CLASS. add SET SCHEMA

* ALTER OPERATOR FAMILY. add SET SCHEMA, FOR SEARCH/FOR ORDER BY

* ALTER ROLE. add REPLICATION/NOREPLICATION options

* ALTER TABLE. Adds collation order, table constraints, many edits.

* reindexdb - add equal signs =

* pg_restore - misc edits, reorg and add some new options

* pg_dumpall - misc edits, new/rearrange options

* pg_dump - misc edits, new/rearrange options, new example

* dropuser - add equal signs =

* droplang - misc edits, add equal signs

* dropdb - add equal signs

* createuser - misc edits, add equal signs

* ALTER TYPE. reorganize synopsis. edits.

* ALTER USER. Add replication/noreplication

* BEGIN. Add DEFERRABLE options

* CLUSTER. Edits to usage notes

* COMMENT. Add new object types, examples

* createlang - misc edits, note, add equal signs

* createdb - misc edits, rearrange options, add equal signs

* clusterdb - add equal signs

* remove space

* note should be info, not warning

* COPY. Add encoding option.

* CREATE DOMAIN. Add collation option.

* CREATE INDEX. A collation.

* CREATE ROLE. Add replication/no replication

* CREATE OPERATOR CLASS. Add FOR SEARCH/ORDER BY.

* CREATE TYPE. Add collatable. Update Compatibility.

* CREATE USER. Add REPLICATION/NOREPLICATION. Make consistent with create role.

* CREATE VIEW. Edits to usage

* CREATE TABLE. Add UNLOGGED table type and COLLATE for table column.
updated - UNLOGGED warnings are per segment.

* CREATE TABLE. Add UNLOGGED table type. UNLOGGED information/warnings are per segment.

* GRANT. minor edits.

* psql - add equal signs, many additions, regorgs, and edits

* COPY - change literal to codeph

* DELETE. Add WITH query clause

* LOCK. SERIALIZABLE xact locking clarifications.

* SET TRANSACTION. Adds deferrable mode.

* DROP COLLATION. Remove redundant privileges statement.

* DROP TYPE. Qualify/hedge type extension compatibility

* EXPLAIN. Add JSON and YAML format examples.

* SET TRANSACTION. Add DEFERRED syntax and note that it is inoperative in gpdb

* REVOKE. add missing spaces in syntax.

* SELECT. Add DISTINCT to several clauses, and may edits.

* TRUNCATE. edits about RESTART and triggers

* VACUUM. deprecate notice for unparenthized syntax.

* SELECT INTO. Add DISTINCT keyword (syntax only), UNLOGGED table keyword and definition.

* INSERT. add WITH [RECURSIVE] clause

* UPDATE. Add WITH [RECURSIVE] clause

* createlang/droplang - remove deprecation note

* CREATE LANGUAGE. Use create extension instead for languages repackaged as extensions.

* pg_dump - --serializable-deferrable is a no-op

* SET TRANSACTION. Add transaction_default_deferred GUC and another unsupported notice

* BEGIN. Note DEFERRABLE has no effect in Greenplum Database

* EXPLAIN. Add missing query from example

* Address review comments.

* edits from Chuck