lsm: Fix description of fs_context_parse_param

The fs_context_parse_param hook already has a description, which seems the
right one according to the code.

Fixes: 8eb687bc ("lsm: Add/fix return values in lsm_hooks.h and fix formatting")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

include/linux/lsm_hooks.h

@@ -100,9 +100,6 @@
  *	the filesystem.
  *	@fc indicates the filesystem context.
  *	@param The parameter.
- *	Return 0 to indicate that the parameter should be passed on to the
- *	filesystem, 1 to indicate that the parameter should be discarded or an
- *	error to indicate that the parameter should be rejected.
  *
  * Security hooks for filesystem operations.
  *