audit: whitespace fix in kernel-parameters.txt

Fixup caught by checkpatch.
Signed-off-by: NRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: NEric Paris <eparis@redhat.com>

Documentation/kernel-parameters.txt

@@ -474,7 +474,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			    RAM until it is fully enabled by the userspace
 			    auditd.
 			Default: unset
-			
+
 	audit_backlog_limit= [KNL] Set the audit queue size limit.
 			Format: <int> (must be >=0)
 			Default: 64