Remove .html from internal doc links.

Author: cfa

doc/Language/faq.pod6

@@ -331,7 +331,7 @@ foo(1)     # ===SORRY!=== Error while compiling ...
 
 L«C<Any>|/type/Any» is a top level class most objects inherit from.
 The C<Any> type object is
-L<the default value|/type/Attribute.html#Trait_is_default> on variables and
+L<the default value|/type/Attribute#Trait_is_default> on variables and
 parameters without an explicit type constraint, which means you'll
 likely see C<(Any)> printed when you output a L<gist|/routine/gist> of
 a variable without any value, such as using L«C<say> routine|/routine/say»:

doc/Language/nativecall.pod6

@@ -650,7 +650,7 @@ say $esponja;
 NativeCall also supports native functions that take functions as arguments.  One
 example of this is using function pointers as callbacks in an event-driven
 system.  When binding these functions via NativeCall, one need only provide the
-equivalent signature as L<a constraint on the code parameter|/type/Signature.html#Constraining_signatures_of_Callables>:
+equivalent signature as L<a constraint on the code parameter|/type/Signature#Constraining_signatures_of_Callables>:
 
     use NativeCall;
     # void SetCallback(int (*callback)(const char *))

doc/Type/Array.pod6

@@ -18,7 +18,7 @@ B<Note> from version 6.d, C<.perl> can be called on multi-dimensional arrays.
 
 =head2 method gist
 
-Exactly the same as L«C<List.gist>|/type/List.html#method_gist»,
+Exactly the same as L«C<List.gist>|/type/List#method_gist»,
 except using square brackets for surrounding delimiters.
 
 =head2 routine pop

doc/Type/Str.pod6

@@ -1044,7 +1044,7 @@ The C<:nth> adverb has readable English-looking variants:
 
 B<NOTE:> I<<< C<.subst-mutate> is deprecated in the 6.d version, and will be
 removed in future ones. You can use L<subst|/routine/subst> with L«C<.=> method
-call assignment operator|/routine/.=.html» or L«C<s///> substitution
+call assignment operator|/routine/.=» or L«C<s///> substitution
 operator|/syntax/s$SOLIDUS$SOLIDUS$SOLIDUS» instead. >>>
 
 Where L<subst|/routine/subst> returns the modified string and leaves the