Advise against using : in ternary WithProperties

master/docs/manual/cfg-properties.rst

@@ -248,15 +248,16 @@ syntaxes in the parentheses.
     If ``propname`` exists, substitute ``replacement``; otherwise,
     substitute an empty string.
 
-``propname:?:sub_if_exists:sub_if_missing``
+``propname:?|sub_if_exists|sub_if_missing``
 
-``propname:#?:sub_if_true:sub_if_false``
+``propname:#?|sub_if_true|sub_if_false``
     Ternary substitution, depending on either ``propname`` being present (with
     ``:?``, similar to ``:+``) or being ``True`` (with ``:#?``, like ``:~``).
-    Notice that there is a colon immediately following the question mark *and*
+    Notice that there is a pipe immediately following the question mark *and*
     between the two substitution alternatives. The character that follows the
     question mark is used as the delimeter between the two alternatives. In the
-    above examples, it is a colon, but any single character can be used.
+    above examples, it is a pipe, but any single character can be used. Using
+    colon is not advised.
 
 
 Although these are similar to shell substitutions, no other