Added usage to C<split>

Added TODO for LIMIT to C<split>
Put code tags around examples in C<split>

lib/Type/Str.pod

@@ -192,19 +192,29 @@ Examples:
     multi method split(Str:D $input:   Str:D $delimiter, $limit = Inf, :$all) returns Positional
     multi method split(Str:D $input: Regex:D $delimiter, $limit = Inf, :$all) returns Positional
 
+Usage:
+
+    split( DELIMITER, EXPR [, LIMIT] [, :all])
+    split( PATTERN, EXPR [, LIMIT] [, :all])
+    EXPR.split( DELIMITER [, LIMIT] [, :all])
+    EXPR.split( PATTERN [, LIMIT] [, :all])
+
 Splits a string up into pieces based on delimiters found in the string.
 
-If C<$delimiter> is a string, it is searched for literally and not treated
+If C<DELIMITER> is a string, it is searched for literally and not treated
 as a regex.
 
-If the named parameter C<:all> is passed, the matches from C<$delimiter>
+If the named parameter C<:all> is passed, the matches from C<DELIMITER>
 are included in the result list.
 
 Note that unlike in Perl 5, empty chunks are not removed from the result list.
 If you want that behavior, consider using L<comb> instead.
 
+=comment TODO Describe behavior of LIMIT
+
 Examples:
 
+=begin code
     say split(';', "a;b;c").perl;          # ("a", "b", "c").list
     say split(';', "a;b;c", :all).perl;    # (("a", ";"), ("b", ";"), "c").list
     say split(';', "a;b;c", 2).perl;       # ("a", "b;c").list
@@ -213,6 +223,7 @@ Examples:
     say split(';', "a;b;c,d").perl;        # ("a", "b", "c,d").list
     say split(/\;/, "a;b;c,d").perl;       # ("a", "b", "c,d").list
     say split(/<[;,]>/, "a;b;c,d").perl;   # ("a", "b", "c", "d").list
+=end code
 
 =head2 routine comb