Update man page to document new tgetent behaviour.

lib/libterm/termcap.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: termcap.3,v 1.17 2000/04/19 13:41:28 blymn Exp $
+.\"	$NetBSD: termcap.3,v 1.18 2000/05/10 11:13:35 blymn Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -119,7 +119,10 @@ and 1 if all goes well.
 It will look in the environment for a
 .Ev TERMCAP
 variable.
-If found, and the value does not begin with a slash,
+If found, and the value does not begin with a slash, the value does
+not contain the ZZ capability (see
+.Em NOTES
+for a description of this capability), 
 and the terminal type
 .Fa name
 is the same as the environment string
@@ -128,8 +131,16 @@ the
 .Ev TERMCAP
 string is used instead of reading a
 .Nm termcap
-file.
-If it does begin with a slash, the string is used as a path name
+file.  If the value does contain the ZZ capability then the 
+.Ev TERM
+environment string is used to read 
+.Nm termcap ,
+if the read fails for any reason the value of
+.Ev TERMCAP
+will be used despite it containing ZZ.
+If 
+.Ev TERMCAP
+does begin with a slash, the string is used as a path name
 of the
 .Nm termcap
 file to search.