nfsd4: remove labeled NFS warning from config help

The working group appears committed to keeping the protocol stable, the
code has gotten some use and seems to work OK.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/Kconfig

@@ -94,9 +94,6 @@ config NFSD_V4_SECURITY_LABEL
 	If you do not wish to enable fine-grained security labels SELinux or
 	Smack policies on NFSv4 files, say N.
 
-	WARNING: there is still a chance of backwards-incompatible protocol changes.
-	For now we recommend "Y" only for developers and testers.
-
 config NFSD_FAULT_INJECTION
 	bool "NFS server manual fault injection"
 	depends on NFSD_V4 && DEBUG_KERNEL