Merge pull request #3269 from Raku/any-minmax-by

Explicitly mention min/max/minmax()'s :by argument

doc/Type/Any.pod6

@@ -567,12 +567,15 @@ Defined as:
 
 Coerces the invocant to L<Iterable|/type/Iterable> and returns the numerically
 smallest element; in the case of C<Hash>es, it returns the C<Pair> with the
-lowest value. In C<sub> form, the invocant is passed as an argument.
+lowest value.
 
 If a L<Callable|/type/Callable> positional argument is provided, each value is
 passed into the filter, and its return value is compared instead of the original
 value. The original value is still the one returned from C<min>.
 
+In C<sub> form, the invocant is passed as an argument and a comparison C<Callable>
+can be specified with the named argument C<:by>.
+
     say (1,7,3).min();              # OUTPUT:«1␤»
     say (1,7,3).min({1/$_});        # OUTPUT:«7␤»
     say min(1,7,3);                 # OUTPUT: «1␤»
@@ -596,6 +599,9 @@ If a L<Callable|/type/Callable> positional argument is provided, each value is
 passed into the filter, and the return value is compared instead of the original
 value. The original value is still the one returned from C<max>.
 
+In C<sub> form, the invocant is passed as an argument and a comparison C<Callable>
+can be specified with the named argument C<:by>.
+
     say (1,7,3).max();                # OUTPUT:«7␤»
     say (1,7,3).max({1/$_});          # OUTPUT:«1␤»
     say max(1,7,3,:by( { 1/$_ } ));   # OUTPUT: «1␤»
@@ -617,6 +623,9 @@ If a L<Callable|/type/Callable> positional argument is provided, each value is
 passed into the filter, and its return value is compared instead of the original
 value. The original values are still used in the returned C<Range>.
 
+In C<sub> form, the invocant is passed as an argument and a comparison C<Callable>
+can be specified with the named argument C<:by>.
+
     say (1,7,3).minmax();        # OUTPUT:«1..7␤»
     say (1,7,3).minmax({-$_});   # OUTPUT:«7..1␤»
     say minmax(1,7,3);           # OUTPUT: «1..7␤»