unhash bug in 4.1bsd csh (w/manual fix)

[ado at elsie.UUCP]

Description:
	The 4.1bsd manual entry for "csh" describes the builtin "unhash"
	command thusly:

		unhash
			Use of the internal hash table to speed location of
			executed programs is disabled.

	While the disabling does indeed occur,
	hashing is reenabled if a "set path" command is used.

Repeat by:
	mkdir /tmp/progs
	unhash
	set path = ( /tmp/progs $path )
	cp /bin/date /tmp/progs/when
	when

	and note that you get the diagnostic "when:  Command not found."
	Had hashing truly been disabled, "when" would have been found.

Fix:
	Change the description of "unhash" in "/usr/man/man1/csh.1" to read:

		Use of the internal hash table to speed location of
		executed programs is disabled until either a "rehash" command
		is given or the "path" variable is modified.
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