Fix some grammar and typos in comments and docs

The documentation fixes are backpatched down to where they apply.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20201031020801.GD3080@telsasoft.com
Backpatch-through: 9.6

diff --git a/doc/src/sgml/ref/pg_rewind.sgml b/doc/src/sgml/ref/pg_rewind.sgml
index 58eda6e351cd6a4ba3553aa067ee5349f001ebe3..f231646ee9bb8839a8ba14ddd5e759afac86ad81 100644 (file)
--- a/doc/src/sgml/ref/pg_rewind.sgml
+++ b/doc/src/sgml/ref/pg_rewind.sgml
@@ -71,7 +71,7 @@ PostgreSQL documentation
    copied from the WAL archive to the <filename>pg_xlog</> directory, or
    fetched on startup by configuring <filename>recovery.conf</>.  The use of
    <application>pg_rewind</> is not limited to failover, e.g.,  a standby
-   server can be promoted, run some write transactions, and then rewinded
+   server can be promoted, run some write transactions, and then rewound
    to become a standby again.
   </para>