[net.sources] correction to locking program documentation

oscar@utcsrgv.UUCP (Oscar M. Nierstrasz) (11/25/83)

The line

	setenv shellpid=$$

should, of course, read

	setenv shellpid $$
-- 

UUCP	{ ihnp4 cornell decwrl watmath uw-beaver ubc-vision sask 
		garfield qucis linus mcgill-vision }!utcsrgv!oscar
  or	{ allegra decvax duke floyd }!utzoo!utcsrgv!oscar