Fix links

Author: stoned

doc/Type/Parameter.pod6

@@ -169,7 +169,7 @@ as it is only used on the parameter.
     # OUTPUT: «X::Assignment::RO: Cannot modify an immutable Int␤»
 
 Other parameters may become raw through use of the 'C<is raw>'
-L<trait|/type/Signature#Parameter_Traits_and_Modifiers>.  These still use
+L<trait|/type/Signature#Parameter_traits_and_modifiers>.  These still use
 their sigil in code.
 
     sub f($x is raw) {
@@ -210,7 +210,7 @@ Defined as:
 
     method rw(Parameter:D: --> Bool:D)
 
-Returns C<True> for L<C<is rw>|/type/Signature#Parameter_Traits_and_Modifiers>
+Returns C<True> for L<C<is rw>|/type/Signature#Parameter_traits_and_modifiers>
 parameters.
 
     my Signature $sig = :(Str $x is rw, Bool :$is-named);
@@ -223,7 +223,7 @@ Defined as:
 
     method copy(Parameter:D: --> Bool:D)
 
-Returns C<True> for L<C<is copy>|/type/Signature#Parameter_Traits_and_Modifiers>
+Returns C<True> for L<C<is copy>|/type/Signature#Parameter_traits_and_modifiers>
 parameters.
 
     my Signature $sig = :(Str $x, Bool :$is-named is copy);