fix(man): dracut.cmdline(7): correct syntax for rd.nonvmf

rd.nonvmf=0 is a double negation, and wrong. Fix it.

Author: mwilck

man/dracut.cmdline.7.asc

@@ -895,7 +895,7 @@ NOTE: letters in the MAC-address must be lowercase!
 
 NVMf
 ~~~~
-**rd.nonvmf=0**::
+**rd.nonvmf**::
     Disable NVMf
 
 **rd.nvmf.hostnqn=**__<hostNQN>__::