Fix unwanted display of X<>

Author: zoffixznet

doc/Language/grammars.pod6

@@ -76,9 +76,9 @@ should only be used to parse text; if you wish to extract complex data, an
 L<action object|/language/grammars#Action_Objects> is recommended to be used in
 conjunction with the grammar.
 
-X<sym>
-X<< :sym<> >>
-X<protoregex>
+X<|sym>
+X<<| :sym<> >>
+X<|protoregex>
 =head2 Protoregexes
 
 If you have a lot of alternations, it may become difficult to produce
@@ -161,7 +161,7 @@ the thing works—all thanks to protoregexes.
 
 =head2 Special Tokens
 
-X<TOP>
+X<|TOP>
 =head3 C<TOP>
 
     grammar Foo {
@@ -179,7 +179,7 @@ Using C<rule TOP> or C<regex TOP> are also acceptable.
 A different token can be chosen to be matched first using the C<:rule> named
 argument to C<.parse>, C<.subparse>, or C<.parsefile> C<Grammar> methods.
 
-X<ws>
+X<|ws>
 =head3 C<ws>
 
 When C<rule> instead of C<token> is used, any whitespace after an
@@ -206,7 +206,7 @@ It's perfectly fine to provide your own C<ws> token:
     }.parse: "4   \n\n 5"; # Fails
 
 
-X<< <?> >>
+X<<| <?> >>
 =head3 Always Succeed Assertion
 
 The C<< <?> >> is the I<always succeed> assertion. When used as a grammar