Adds new Label stuff Raku#4043

doc/Type/Label.pod6

@@ -7,10 +7,10 @@
     class Label {}
 
 Labels are used in Raku to tag loops so that you can specify
-the one you want to jump to with L«statements such as
+the specific one you want to jump to with L«statements such as
 C<last>|/language/control#LABELs». You can use it to jump out of loops
 and get to outer ones, instead of just exiting the current loop or going
-to the statement before.
+to the previous statement.
 
 =begin code :skip-test<compile time error>
 USERS:          # the label
@@ -24,9 +24,9 @@ for @users -> $u {
 say USERS.^name;        # OUTPUT: «Label␤»
 =end code
 
-Those label are objects of type C<Label>, as shown in the last statement. Labels
-can be used in any loop construct, as long as they appear right before the loop
-statement.
+Those labels are objects of type C<Label>, as shown in the last statement.
+Labels can be used in any loop construct, as long as they appear right before
+the loop statement.
 
 =begin code
 my $x = 0;
@@ -59,17 +59,24 @@ You can use, however, other alphabets like here:
 
 =head2 method name
 
-Defined as:
-
-    method name()
-
 Not terribly useful, returns the name of the defined label:
 
     A: while True {
       say A.name; # OUTPUT: «A␤»
       last A;
     }
 
+=head2 method file
+
+Returns the file the label is defined in.
+
+=head2 method line
+
+Returns the line where the label has been defined.
+
+=head2 method Str
+
+Converts to a string including the name, file and line it's been defined in.
 
 =head2 method next