Fixes space after comma

Author: JJ

doc/Type/Str.pod6

@@ -1247,7 +1247,7 @@ changes:
 
 In this case, neither origin nor target in the C<Pair> are C<Str>; the method
 with the C<Pair> signature then calls the second, making this call above
-equivalent to C<"abcd".trans: ["a"] => ["zz"],> (with the comma behind, making
+equivalent to C<"abcd".trans: ["a"] => ["zz"], > (with the comma behind, making
 it a C<Positional>, instead of a C<Pair>), resulting in the behavior shown as
 output.