Fix typo in patch uri.

Reported by:	Martin Simmons
Approved by:	so

website/static/security/advisories/FreeBSD-EN-21:02.extattr.asc

@@ -69,8 +69,8 @@ a) Download the relevant patch from the location below, and verify the
 detached PGP signature using your PGP utility.
 
 [FreeBSD 11.4]
-# fetch https://security.FreeBSD.org/patches/EN-12:02/extattr.patch
+# fetch https://security.FreeBSD.org/patches/EN-21:02/extattr.patch
-# fetch https://security.FreeBSD.org/patches/EN-12:02/extattr.patch.asc
+# fetch https://security.FreeBSD.org/patches/EN-21:02/extattr.patch.asc
 # gpg --verify extattr.patch.asc
 
 b) Apply the patch.  Execute the following commands as root:
@@ -111,19 +111,19 @@ The latest revision of this advisory is available at
 <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:02.extattr.asc>
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-=XIov
+=2cLo
 -----END PGP SIGNATURE-----