Clean up tr/// Perl 5 docs

- Remove mentions of speculations
- Just link to Str.trans for docs
- Mention TR///

Author: zoffixznet

doc/Language/5to6-perlfunc.pod6

@@ -1635,15 +1635,13 @@ Not available in Perl 6.
 
 =item tr///
 
-Works similarly to how it does in Perl 5. The one caveat is that ranges are specified differently.
-Instead of using a range "a-z", you would use "a..z", i. e. with Perl's
-range operator. In Perl 6, C<tr///> has a method version, which is
-better documented, called C<.trans>. C<.trans> uses a list of pairs, as
-follows: C<< $x.trans(['a'..'c'] => ['A'..'C'], ['d'..'q'] =>
-['D'..'Q'], ['r'..'z'] => ['R'..'Z']); >> A much more extensive
-description of the uses of C<.trans> can be found at
-L<https://design.perl6.org/S05.html#Transliteration>. The C<y///>
-equivalent has been done away with.
+Works similarly to how it does in Perl 5. The one caveat is that ranges are
+specified differently. Instead of using a range "a-z", you would use "a..z",
+i.e. with Perl's range operator. In Perl 6, C<tr///> has a method version,
+called L<trans>, which  offers a few additional features.
+
+Perl 5's C</r> flag is instead implemented as C<TR///> operator.
+The C<y///> equivalent does not exist.
 
 =head2 truncate