Several documentation updates for the pending 1.2 release:

* More mentions of new --only-indexes feature
 * Note we now support up to Postgres 9.3, and get rid of outdated list
   of supported operating systems. (As far as we know, pg_repack should
   build on any platforms supported by PostgreSQL itself, although no one
   has tested the Windows build in a long time.)
 * Remove most of the warnings about data corruption possible with concurrent
   DDL: this should no longer be a concern now that we hold an ACCESS SHARE
   lock during full-table repacks. Keep a short warning about old versions
   being susceptible to this problem, just to make clear that it's fixed now
   and as an enticement to upgrade.
 * A few grammar, phrasing, and typo fixes

bin/pg_repack.c

@@ -1031,7 +1031,7 @@ repack_one_table(const repack_table *table, const char *orderby)
 		{
 			ereport(WARNING,
 				(errcode(E_PG_COMMAND),
-				 errmsg("the table \"%s\" has already a trigger called \"%s\"",
+				 errmsg("the table \"%s\" already has a trigger called \"%s\"",
 					table->target_name, PQgetvalue(res, 0, 0)),
 				 errdetail(
 					"The trigger was probably installed during a previous"