Update the description of strict mode to current reality. Aliases

haven't needed to be defined before they are used since sudo 1.7.

doc/visudo.cat

@@ -63,11 +63,11 @@ DDEESSCCRRIIPPTTIIOONN
 
      --ss, ----ssttrriicctt
                  Enable _s_t_r_i_c_t checking of the _s_u_d_o_e_r_s file.  If an alias is
-                 used before it is defined, vviissuuddoo will consider this a parse
+                 referenced but not actually defined or if there is a cycle in
-                 error.  Note that it is not possible to differentiate between
+                 an alias, vviissuuddoo will consider this a parse error.  Note that
-                 an alias and a host name or user name that consists solely of
+                 it is not possible to differentiate between an alias and a
-                 uppercase letters, digits, and the underscore (`_')
+                 host name or user name that consists solely of uppercase
-                 character.
+                 letters, digits, and the underscore (`_') character.
 
      --VV, ----vveerrssiioonn
                  Print the vviissuuddoo and _s_u_d_o_e_r_s grammar versions and exit.

doc/visudo.man.in

@@ -189,7 +189,8 @@ Enable
 checking of the
 \fIsudoers\fR
 file.
-If an alias is used before it is defined,
+If an alias is referenced but not actually defined
+or if there is a cycle in an alias,
 \fBvisudo\fR
 will consider this a parse error.
 Note that it is not possible to differentiate between an

doc/visudo.mdoc.in

@@ -182,7 +182,8 @@ Enable
 checking of the
 .Em sudoers
 file.
-If an alias is used before it is defined,
+If an alias is referenced but not actually defined
+or if there is a cycle in an alias,
 .Nm
 will consider this a parse error.
 Note that it is not possible to differentiate between an