docs: Fix sample call to GnuPG (reported by Fabio Coatti)

doc/genkernel.8.txt

@@ -283,7 +283,7 @@ INITIALIZATION
 *--gpg*::
     Add support for GnuPG 1.x, the portable standalone branch of GnuPG.
     A key can be made from
-    `gpg --encrypt --symmetric /path/to/LUKS-key > /path/to/LUKS-key.gpg` .
+    `gpg --symmetric -o /path/to/LUKS-key.gpg /path/to/LUKS-key` .
     After that, re-point the *root_key* argument to the new .gpg file.
 
 *--no-busybox*::

maintenance/docmatcher.py

@@ -21,7 +21,7 @@ for app in ('DEVICE_MAPPER', 'UNIONFS_FUSE', 'BUSYBOX', 'DMRAID', 'LVM', 'ISCSI'
 EXTRA_VARIABLES = tuple(EXTRA_VARIABLES)
 
 IGNORE_OPTIONS = ('help', 'version')
-_GPG_PARAMETERS = ('encrypt', 'symmetric')
+_GPG_PARAMETERS = ('symmetric', )
 IGNORE_PARAMETERS = _GPG_PARAMETERS
 DEPRECATED_PARAMETERS = ('lvm2', 'evms2', 'gensplash', 'gensplash-res')