doc: Sync classref with Mono build

modules/mono/doc_classes/CSharpScript.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="CSharpScript" inherits="Script" category="Core" version="3.2">
+<class name="CSharpScript" inherits="Script" version="3.4">
 	<brief_description>
 		A script implemented in the C# programming language (Mono-enabled builds only).
 	</brief_description>
@@ -12,7 +12,7 @@
 	</tutorials>
 	<methods>
 		<method name="new" qualifiers="vararg">
-			<return type="Object">
+			<return type="Variant">
 			</return>
 			<description>
 				Returns a new instance of the script.

modules/mono/doc_classes/GodotSharp.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="GodotSharp" inherits="Object" category="Core" version="3.2">
+<class name="GodotSharp" inherits="Object" category="Core" version="3.4">
 	<brief_description>
 		Bridge between Godot and the Mono runtime (Mono-enabled builds only).
 	</brief_description>