manual: fix spelling typos

I've bracketed the changes to make it easier to pick out.

	enlengthen -> extend
	enlengthened -> extended
	excep[e]tions -> exceptions
	exten[da]ble -> exten[si]ble
	implement[o]r -> implement[e]r
	licen[c]e -> licen[s]e
	optimzed -> optim[i]zed
	overriden -> overrid[d]en
	param[a]ter -> param[e]ter

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2012-10-27  Mike Frysinger  <vapier@gentoo.org>

	* manual/arith.texi: Fix spelling typos.
	* manual/contrib.texi: Likewise.
	* manual/crypt.texi: Likewise.
	* manual/filesys.texi: Likewise.
	* manual/llio.texi: Likewise.
	* manual/locale.texi: Likewise.
	* manual/message.texi: Likewise.
	* manual/nss.texi: Likewise.
	* manual/socket.texi: Likewise.
	* manual/stdio.texi: Likewise.
	* manual/string.texi: Likewise.
	* manual/sysinfo.texi: Likewise.