patch(1): update example
 [rsc] --rw-rw-r-- M 836007 glenda sys 2375 Apr 14 10:00 sys/man/1/patch
	/n/sourcesdump/2006/0414/plan9/sys/man/1/patch:86,92 - 
	/n/sourcesdump/2006/0415/plan9/sys/man/1/patch:86,92
	  .IR pwd ,
	  which you have modified locally:
	  .EX
	- % patch/create pwd-errors /sys/src/cmd/pwd.c
	+ % patch/create pwd-errors user@host.dom /sys/src/cmd/pwd.c
	  Fix pwd to print errors to fd 2 rather than 1.
	  ^D
	  %