Type::Str.lines: document new :$chomp parameter

Documents:
rakudo/rakudo@1bcc5d7

doc/Type/Str.pod6

@@ -613,11 +613,12 @@ is returned by using features which explicitly set the top-level capture.
 
 Defined as:
 
-    multi method lines(Str:D: $limit)
-    multi method lines(Str:D:)
+    multi method lines(Str:D: $limit, :$chomp = True)
+    multi method lines(Str:D:, :$chomp = True)
 
-Returns a list of lines (without trailing newline characters), i.e. the
-same as a call to C<$input.comb( / ^^ \N* /, $limit )> would.
+Returns a list of lines. By default, it chomps line endings the same as a
+call to C<$input.comb( / ^^ \N* /, $limit )> would. To keep line endings,
+set the optional named parameter C<$chomp> to C<False>.
 
 Examples:
 
@@ -626,6 +627,10 @@ Examples:
     say "a\nb".lines.elems;    # OUTPUT: «2␤»
     say "a\n".lines.elems;     # OUTPUT: «1␤»
 
+    # Keep line endings
+    say lines(:!chomp, "a\nb").raku;  # OUTPUT: «("a\n", "b").Seq␤»
+    say "a\n".lines(:!chomp).elems;   # OUTPUT: «1␤»
+
 You can limit the
 number of lines returned by setting the C<$limit> variable to a non-zero,
 non-C<Infinity> value: