Add missing 'method' words

Author: stoned

doc/Type/Num.pod6

@@ -107,23 +107,23 @@ Defined as:
 
 Throws C<X::Cannot::Capture>.
 
-=head2 Int
+=head2 method Int
 
     method Int(Num:D:)
 
 Converts the number to an L<Int|/type/Int>. L<Fails|/routine/fail> with
 C<X::Numeric::CannotConvert> if the invocant L«is a C<NaN>|/routine/isNaN»
 or C<Inf>/C<-Inf>. No L<rounding|/routine/round> is performed.
 
-=head2 Rat
+=head2 method Rat
 
     method Rat(Num:D: Real $epsilon = 1e-6)
 
 Converts the number to a L<Rat|/type/Rat> with C<$epsilon> precision. If the invocant
 is a C<Inf>, C<-Inf>, or a C<NaN>, converts them to a L<Rat|/type/Rat> with C<0>
 L<denominator|/routine/denominator> and C<1>, C<-1>, or C<0> L<numerator|/routine/numerator>, respectively.
 
-=head2 FatRat
+=head2 method FatRat
 
     method FatRat(Num:D: Real $epsilon = 1e-6)