Added documentation

Docs/manual.texi:
  Added documentation.

Docs/manual.texi

@@ -38808,6 +38808,12 @@ though, so Version 3.23 is not released as a stable version yet.
 @appendixsubsec Changes in release 3.23.28
 @itemize @bullet
 @item
+Added new options @code{--pager[=...]}, @code{--no-pager},
+@code{--tee=...} and @code{--no-tee} to the @code{mysql} client.  The
+new corresponding interactive commands are @code{pager}, @code{nopager},
+@code{tee} and @code{notee}. @xref{mysql}, @code{mysql --help} and the
+interactive help for more information.
+@item
 Fixed a major performance bug in the table locking code when you
 constantly had a LOT of @code{SELECT} running on a table on which you
 also did a lot of @code{UPDATE} and @code{INSERT}.  The symptom was that