Merge branch 'jl/nor-or-nand-and'

Eradicate mistaken use of "nor" (that is, essentially "nor" used
not in "neither A nor B" ;-)) from in-code comments, command output
strings, and documentations.

* jl/nor-or-nand-and:
  code and test: fix misuses of "nor"
  comments: fix misuses of "nor"
  contrib: fix misuses of "nor"
  Documentation: fix misuses of "nor"

git-am.sh

@@ -530,7 +530,7 @@ Use \"git am --abort\" to remove it.")"
 		esac
 	fi
 
-	# Make sure we are not given --skip, --continue, nor --abort
+	# Make sure we are not given --skip, --continue, or --abort
 	test "$skip$resolved$abort" = "" ||
 		die "$(gettext "Resolve operation not in progress, we are not resuming.")"