GDScript: Deprecate inst_to_dict() and dict_to_inst() functions

modules/gdscript/doc_classes/@GDScript.xml

@@ -74,7 +74,7 @@
 				[/codeblock]
 			</description>
 		</method>
-		<method name="dict_to_inst">
+		<method name="dict_to_inst" deprecated="Consider using [method JSON.to_native] or [method Object.get_property_list] instead.">
 			<return type="Object" />
 			<param index="0" name="dictionary" type="Dictionary" />
 			<description>
@@ -103,12 +103,11 @@
 				[b]Note:[/b] Calling this function from a [Thread] is not supported. Doing so will return an empty array.
 			</description>
 		</method>
-		<method name="inst_to_dict">
+		<method name="inst_to_dict" deprecated="Consider using [method JSON.from_native] or [method Object.get_property_list] instead.">
 			<return type="Dictionary" />
 			<param index="0" name="instance" type="Object" />
 			<description>
 				Returns the passed [param instance] converted to a Dictionary. Can be useful for serializing.
-				[b]Note:[/b] Cannot be used to serialize objects with built-in scripts attached or objects allocated within built-in scripts.
 				[codeblock]
 				var foo = "bar"
 				func _ready():
@@ -121,6 +120,8 @@
 				[@subpath, @path, foo]
 				[, res://test.gd, bar]
 				[/codeblock]
+				[b]Note:[/b] This function can only be used to serialize objects with an attached [GDScript] stored in a separate file. Objects without an attached script, with a script written in another language, or with a built-in script are not supported.
+				[b]Note:[/b] This function is not recursive, which means that nested objects will not be represented as dictionaries. Also, properties passed by reference ([Object], [Dictionary], [Array], and packed arrays) are copied by reference, not duplicated.
 			</description>
 		</method>
 		<method name="is_instance_of">