Rephrase the Pair.freeze introduction.

The Pair/Scalar behavior is not something to 'avoid', it just is the behaviour.
Explain that such behaviour can be 'changed' (not 'avoided') via
Pair.freeze.

Author: fluca1978

doc/Type/Pair.pod6

@@ -65,8 +65,9 @@ $pair.say; # OUTPUT: a => value B
 Please also note that this behavior is totally unrelated to the way used to build the C<Pair> itself
 (i.e., explicit usage of C<new>, use of colon, fat arrow), as well as if the C<Pair> is bound
 to a variable.
-It is possible to avoid such behaviour forcing the C<Pair> to remove the scalar container
-and to hold the effective value itself using the method L<freeze|/type/Pair#method_freeze>:
+
+It is possible to change the above behaviour forcing the C<Pair> to remove the scalar container
+and to hold the effective value itself via the method L<freeze|/type/Pair#method_freeze>:
 
 =begin code
 my $v = 'value B';