Correct a typo.

Submitted by:	Kenta Suzumoto <kentas hush com>

share/security/advisories/FreeBSD-EN-13:04.freebsd-update.asc

@@ -38,7 +38,7 @@ FreeBSD releases.
 II.  Problem Description
 
 The freebsd-update(8) utility always updates shared libraries first, so
-new or updated libraries will be avaialble when binaries that use them are
+new or updated libraries will be available when binaries that use them are
 installed or updated.  If shared libraries appear in a directory which
 does not already exist on the target system, freebsd-update(8) will
 attempt to install them before creating the directory.
@@ -141,17 +141,17 @@ The latest revision of this Errata Notice is available at
 http://security.FreeBSD.org/advisories/FreeBSD-EN-13:04.freebsd-update.asc
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