doc/Makefile: Don't show Makefile comments in output
The comments makes sense when editing Makefile, but not when watching its
output where it looks too much like error messages.
a -> a not a symlink
a -> b
popping symlink.patch
now at: base.patch
applying symlink.patch
now at: symlink.patch
a -> b
popping removesl.patch
now at: symlink.patch
applying removesl.patch
now at: removesl.patch
C b