Link to Pair type and slurpy arguments.

Author: fluca1978

doc/Language/5to6-nutshell.pod6

@@ -648,7 +648,7 @@ Replaced by C«+<» and C«+>» .
 In Perl 5, C«=>» acted just like a comma, but also quoted its left-hand
 side.
 
-In Perl 6, C«=>» is the Pair operator, which is quite different in
+In Perl 6, C«=>» is the L<Pair|/type/Pair> operator, which is quite different in
 principle, but works the same in many situations.
 
 If you were using C«=>» in hash initialization, or in passing arguments to
@@ -664,8 +664,10 @@ of a list, or in passing arguments to a sub that expects a flat list of
 KEY, VALUE, KEY, VALUE, then continuing to use C«=>» may break your code.
 The easiest workaround is to change the fat comma to a regular comma, and
 manually add quotes to its left-hand side. Or, you can change the sub's API
-to slurp a hash. A better long-term solution is to change the sub's API to
-expect Pairs. However, this requires you to change all sub calls at once.
+to L<slurp a hash|/type/Signature#Slurpy_(A.K.A._Variadic)_Parameters>.
+A better long-term solution is to change the sub's API to
+expect L<Pair|/type/Pair>s; however, this requires you to change
+all sub calls at once.
 
 =begin code :lang<perl5>
     # Perl 5