Mention P5 equivalents for print/printf/say

doc/Language/5to6-perlfunc.pod6

@@ -1198,6 +1198,9 @@ C<print> can be used as a function in Perl 6, writing to standard
 out. To use C<print> as a function with a filehandle I<instead> of
 standard out, you can use a method call: C<$fh.print("howdy!")>
 
+The Perl 6 ecosystem has a module C<P5print> which exports a C<print>
+function that mimics the original Perl 5 behaviour as much as possible.
+
 =head2 printf
 
 =item printf FORMAT, LIST
@@ -1209,6 +1212,9 @@ L<sprintf|https://docs.perl6.org/type/Str#sub_sprintf> for details
 on acceptable format directives. To print to a filehandle other than
 STDOUT, use the L«C<.printf>|/routine/printf» method on that filehandle.
 
+The Perl 6 ecosystem has a module C<P5print> which exports a C<printf>
+function that mimics the original Perl 5 behaviour as much as possible.
+
 =head2 prototype
 
 =item prototype FUNCTION
@@ -1452,6 +1458,9 @@ The use of the colon as an "invocant marker" here is discussed at
 L<https://design.perl6.org/S03.html#line_4019>. Alternately, you can use
 a method call: C<$fh.say("howdy!")>
 
+The Perl 6 ecosystem has a module C<P5print> which exports a C<say>
+function that mimics the original Perl 5 behaviour as much as possible.
+
 =head2 scalar
 
 =item scalar EXPR