document factotum quoting rules in response to local
user confusion.

Reference: /n/sources/patch/maybe/man-factotum
Date: Mon Jun  7 18:20:29 CES 2010
Signed-off-by: quanstro@quanstro.net

--- /sys/man/4/factotum	Mon Jun  7 18:19:59 2010
+++ /sys/man/4/factotum	Mon Jun  7 18:19:57 2010
@@ -235,13 +235,14 @@
 .PP
 A
 .I "key tuple
-is a space delimited list of 
+is a whitespace delimited list of 
 .IB attribute = value
 pairs.  An attribute whose name begins with an exclamation point
 .RB ( ! )
 does not appear when reading the
 .B ctl
-file.
+file.  Values with embedded whitespace or single quotes are quoted as in
+.IR rc (1).
 The required attributes depend on the authentication protocol.
 .PP
 .BR P9sk1 ,
@@ -724,5 +725,7 @@
 is the reason for the error.
 .PD
 .RE
+.SH "SEE ALSO"
+.IR secstore (1).
 .SH SOURCE
 .B /sys/src/cmd/auth/factotum