jfs: Remove obsolete email address

The MAINTAINERS file suffices.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

Documentation/filesystems/jfs.txt

@@ -48,7 +48,5 @@ nodiscard(*)	block device when blocks are freed. This is useful for SSD
 		The minlen value of discard overrides the minlen value given
 		on an FITRIM ioctl().
 
-Please send bugs, comments, cards and letters to shaggy@linux.vnet.ibm.com.
-
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