Clarify special vars section

Author: Mouq

lib/Language/variables.pod

@@ -401,8 +401,6 @@ dynamic variable using L<the * twigil|#The_*_Twigil>.
 
 =head2 The C<state> Declarator
 
-=head2 The C<state> Declarator
-
 =head2 The C<augment> Declarator
 
 =head2 The C<supersede> Declarator
@@ -413,6 +411,11 @@ dynamic variable using L<the * twigil|#The_*_Twigil>.
 
 =head1 Special Variables
 
+Perl 5 is infamous for its many obscure special variables. Perl 6 also
+has special variables, but only has three that are extra short because
+of how often they're used. Other special variables have longer, more
+descriptive names.
+
 =head2 Often-Used Variables
 
 =comment TODO: find a better heading
@@ -429,7 +432,7 @@ There are three special variables that are available in every block:
 
 =end table
 
-=head3 C<$_>
+=head3 The C<$_> Variable
 
 C<$_> is the topic variable. It is the default parameter for blocks that do
 not have an explicit signature, so constructs like C<for @array { ... }>
@@ -463,7 +466,7 @@ This outputs:
     d$e
     ij*
 
-=head3 C<$/>
+=head3 The C<$/> Variable
 
 C<$/> is the match variable. It stores the result of each regex match, and
 usually contains objects of type L<Match>.
@@ -480,7 +483,7 @@ Other match variables are aliases to elements of C<$/>:
     $1          # same as $/[1]
     $<named>    # same as $/<named>
 
-=head3 C<$!>
+=head3 The C<$!> Variable
 
 C<$!> is the error variable. If a C<try> block or statement prefix catches
 an exception, that exception is stored in C<$!>. If no exception was caught,