Split 5to6 section into 3 paragraphs (#4559)

* Arrow op: directs to => and shrunk.

* Arrow op continues

Author: 0rir

doc/Language/5to6-perlop.rakudoc

@@ -44,13 +44,16 @@ my $list   = (1,);     # a List in a scalar container
 
 =head2 The arrow operator
 
-As you typically will not be using references in Raku, the arrow is
-probably less useful as a dereferencing operator. If you do need to
-dereference something, however, the arrow is the dot. It is also the dot
-for method calls. So, Perl's C«$arrayref->[7]» becomes
-C<$arrayref.[7]> in Raku and, similarly, C«$user->name» becomes
-C<$user.name>. The C«=>» arrow is used for constructing L<C<Pair>|/type/Pair>s, see
-L<Pair term documentation|/language/terms#Pair>.
+For the Perl C«=>» arrow, see the 
+L<Comma operator|/language/5to6-perlop#Comma_operator>.
+
+The dereferencing operator, C«->», is replaced by the dot, which is
+also used for method calls.  So Perl's C«$arrayref->[7]» becomes
+Raku's C<$arrayref.[7]> and C«$user->name» becomes C<$user.name>.
+Note that dereferencing is rare in Raku.
+
+Raku uses the C<->> to attach L<Signatures|/language/Signature> to
+L<Blocks|/language/Block>.
 
 =head2 Auto-increment and auto-decrement