Adds a Type page for StrDistance

Closes #691

Author: JJ

doc/Type/StrDistance.pod6

@@ -0,0 +1,38 @@
+=begin pod
+
+=TITLE class StrDistance
+
+=SUBTITLE Contains the result of a string transformation.
+
+C<StrDistance> objects are used to represent the return of the L<tr|https://docs.perl6.org/syntax/tr$SOLIDUS$SOLIDUS$SOLIDUS> operator.
+
+    say (($ = "fold") ~~ tr/old/new/).^name;# OUTPUT: «StrDistance␤»
+
+A C<StrDistance> object will stringify to the resulting string after the transformation, and will numify to the distance between the two strings.
+
+=begin code
+my $str = "fold";
+my $str-dist = ($str ~~ tr/old/new/);
+say ~$str-dist;  # OUTPUT: «fnew␤»
+say +$str-dist;  # OUTPUT: «3␤»                                       │
+=end code
+
+=head1 Methods
+
+=head2 before
+
+Property that returns the string before the transformation:
+
+=for code :preamble<my $str = "fold"; my $str-dist = ($str ~~ tr/old/new/); >
+say $str-dist.before; #OUTPUT: «fold␤»
+
+=head2 after
+
+Returns the string after the transformation
+
+=for code :preamble<my $str = "fold"; my $str-dist = ($str ~~ tr/old/new/); >
+say $str-dist.after; #OUTPUT: «fnew␤»
+
+=end pod
+
+# vim: expandtab softtabstop=4 shiftwidth=4 ft=perl6

xt/words.pws

@@ -381,6 +381,7 @@ findmethod
 flatmap
 flipflop
 fmt
+fnew
 foreach
 formatter
 formline
@@ -850,6 +851,7 @@ plaintext
 pluggable
 png
 podtohtml
+polation
 polymod
 polymorphism
 portably
@@ -1371,4 +1373,3 @@ yyyy
 zef
 zoffixznet
 zwj
-polation