Fixed a small bug in the doc

Author: grizzlysmit

doc/Type/Int.pod6

@@ -48,7 +48,7 @@ Example:
 
 Defined as:
 
-    multi sub    expmod(Int $y, Int $mod) returns Int:D
+    multi sub    expmod(Int:D $x, Int $y, Int $mod) returns Int:D
     multi method expmod(Int:D: Int $y, Int $mod) returns Int:D
 
 Returns the given C<Int> raised to the C<$y> power within modulus C<$mod>.