put symbols in C<...> like in other headings

Author: schultzdavid

doc/Language/operators.rakudoc

@@ -2477,7 +2477,7 @@ Note that setting C<$*TOLERANCE = 0> will cause all comparisons to fail.
         say 1 ≅ 1;        # OUTPUT: «False␤»
     }
 
-=head2 infix (elem), infix ∈
+=head2 infix C<(elem)>, infix <∈>
 
     multi infix:<(elem)>($a,$b --> Bool:D)
 
@@ -2533,7 +2533,7 @@ C<!(==)>.
     say (1, 2, 3) ≢ (1, 3, 2); # OUTPUT: «False␤»
     =end code
 
-=head2 infix (cont), infix ∋
+=head2 infix C<(cont)>, infix C<∋>
 
     multi infix:<(cont)>($a,$b --> Bool:D)