Remove verbage on NYI methods

Also remove headings since they are NYI and making them
searchable isn't helpful.

Closes #4464

doc/Type/IO/CatHandle.rakudoc

@@ -700,100 +700,17 @@ to be closed.
 The C<IO::CatHandle> type overrides these methods
 to throw a L«C<X::NYI>|/type/X::NYI» exception.
 
-=head2 method flush
-
     multi method flush(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method nl-out
-
     multi method nl-out(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method out-buffer
-
     multi method out-buffer(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method print
-
     multi method print(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method printf
-
     multi method printf(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method print-nl
-
     multi method print-nl(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method put
-
     multi method put(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method say
-
     multi method say(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method write
-
     multi method write(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method WRITE
-
     multi method WRITE(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method READ
-
+    multi method READ(|)
     multi method EOF(|)
 
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
-=head2 method EOF
-
-    multi method EOF(|)
-
-The C<IO::CatHandle> type overrides this method to throw a C<X::NYI>
-exception. If you have a good idea for how this method should behave,
-L<tell Rakudo developers about it|https://web.libera.chat/?channel=#raku-dev>!
-
 =end pod