Add documentation for FunctionCallbackInfo [skip ci]

v8/v8@4fdf9fd

Author: pinepain

stubs/src/CallbackInfo.php

@@ -32,20 +32,33 @@ public function GetContext(): Context
     }
 
     /**
+     * Returns the receiver. This corresponds to the "this" value.
+     *
      * @return \V8\ObjectValue
      */
     public function This(): ObjectValue
     {
     }
 
     /**
+     * If the callback was created without a Signature, this is the same
+     * value as This(). If there is a signature, and the signature didn't match
+     * This() but one of its hidden prototypes, this will be the respective
+     * hidden prototype.
+     *
+     * Note that this is not the prototype of This() on which the accessor
+     * referencing this callback was found (which in V8 internally is often
+     * referred to as holder [sic]).
+     *
      * @return \V8\ObjectValue
      */
     public function Holder(): ObjectValue
     {
     }
 
     /**
+     * The ReturnValue for the call
+     *
      * @return \V8\ReturnValue
      */
     public function GetReturnValue(): ReturnValue

stubs/src/FunctionCallbackInfo.php

@@ -32,17 +32,26 @@ public function Length(): int
     }
 
     /**
+     * Get available arguments
+     *
      * @return Value[] | StringValue[] | SymbolValue[] | NumberValue[] | ObjectValue[] | ArrayObject[] | FunctionObject[] | StringObject[] | SymbolObject[]
      */
     public function Arguments(): array
     {
     }
 
+    /**
+     * For construct calls, this returns the "new.target" value.
+     *
+     * @return Value
+     */
     public function NewTarget(): Value
     {
     }
 
     /**
+     * Indicates whether this is a regular call or a construct call.
+     *
      * @return bool
      */
     public function IsConstructCall(): bool