kernel-parameters: remove outdated 'noresidual' parameter

The PPC specific kernel parameter 'noresidual' was removed in v2.6.27,
though commit 917f0af9 ("powerpc: Remove
arch/ppc and include/asm-ppc").
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/kernel-parameters.txt

@@ -1974,8 +1974,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	noreplace-smp	[X86-32,SMP] Don't replace SMP instructions
 			with UP alternatives
 
-	noresidual	[PPC] Don't use residual data on PReP machines.
-
 	nordrand	[X86] Disable the direct use of the RDRAND
 			instruction even if it is supported by the
 			processor.  RDRAND is still available to user