make a single list and don't speculate about use

Author: tbrowder

doc/Language/modules-core.pod6

@@ -7,22 +7,13 @@
 The Perl core has a few modules you may want to use.  Following is a
 list of them along with a link to their source code.
 
-=head1 Modules with external utility
-
-The following modules are known to used by external programs and modules.
-
 =item L<CompUnit::Repository::Staging|https://github.com/rakudo/rakudo/blob/nom/lib/CompUnit/Repository/Staging.pm>    Used by distribution build tools
 =item L<NativeCall|https://github.com/rakudo/rakudo/blob/nom/lib/NativeCall.pm6>    Used by many external modules
 =item L<NativeCall::Types|https://github.com/rakudo/rakudo/blob/nom/lib/NativeCall/Types.pm6>    Used by C<NativeCall>
 =item L<NativeCall::Compiler::GNU|https://github.com/rakudo/rakudo/blob/nom/lib/NativeCall/Compiler/GNU.pm6>    Used by C<NativeCall>
 =item L<NativeCall::Compiler::MSVC|https://github.com/rakudo/rakudo/blob/nom/lib/NativeCall/Compiler/MSVC.pm6>    Used by C<NativeCall>
 =item L<Pod::To::Text|https://github.com/rakudo/rakudo/blob/nom/lib/Pod/To/Text.pm6>    Used by several external modules
 =item L<Test|https://github.com/rakudo/rakudo/blob/nom/lib/Test.pm6>    Provides routines for L<testing|/language/testing>
-
-=head1 Modules for internal use
-
-The following modules are not intended to be used externally.
-
 =item L<experimental|https://github.com/rakudo/rakudo/blob/nom/lib/experimental.pm6>
 =item L<newline|https://github.com/rakudo/rakudo/blob/nom/lib/newline.pm6>