Document Code.of()

Author: zoffixznet

doc/Type/Code.pod6

@@ -58,6 +58,17 @@ C<count> will return C<Inf>. Named parameters do not contribute.
     say &args.count;                # 2
     say &slurpy.count;              # Inf
 
+=head2 of
+
+Defined as:
+
+    method of(Code:D:) returns Mu
+
+Returns the return type constraint of the C<Code>:
+
+    m: say sub () returns Int {}.of
+    # OUTPUT: (Int)
+
 =head2 method signature
 
 Defined as: