Remove duplicate period

Author: coke

doc/Type/Metamodel/Primitives.pod6

@@ -85,7 +85,7 @@ Changes C<$object> to be of type C<$type>. This only works if C<$type>
 type-checks against the current type of C<$object>, and if the storage of
 C<$object> is a subset of that of C<$type>. N<As of Raku 2019.11, this method
  requires
-L<special arrangements|https://github.com/rakudo/rakudo/issues/3414#issuecomment-573251877>.>.
+L<special arrangements|https://github.com/rakudo/rakudo/issues/3414#issuecomment-573251877>.>
 
 =head2 method is_type