Remove pointless headings

Author: Mouq

lib/Language/Sets_Bags_and_Mixes.pod

@@ -26,9 +26,7 @@ An I<immutable> set of unique values or objects. These values can be
 accessed via the C<{ }> postcircumfix, and always have a value of either
 C<True> or C<False>. For a mutable set, see L<SetHash>.
 
-=head2 Operators
-
-=head3 sub set
+=head2 sub set
 
     sub set(*@args --> Set)
 
@@ -52,15 +50,13 @@ mutable collection of weighted values, see L<BagHash>.
 
     bag('a', 'b', 'c', 'a', 'd', 'a')<a> === 3
 
-=head2 Operators
-
-=head3 sub bag
+=head2 sub bag
 
     sub bag(*@args --> Bag)
 
 Creates a new C<Bag> from C<@args>.
 
-=head2 class BagHash
+=head1 class BagHash
 
     class BagHash does Baggy { }
 
@@ -78,9 +74,7 @@ via the C<{ }> postcircumfix. For a mutable collection, see L<MixHash>.
     # TODO: More useful example
     {a => 1.3, b => 4.8, c => 8}.Mix<b> == 4.8 # True
 
-=head2 Operators
-
-=head3 sub mix
+=head2 sub mix
 
     sub mix(*@args --> Mix)