Mono: Update welcome message with current state

modules/mono/editor/godotsharp_editor.cpp

@@ -457,12 +457,12 @@ GodotSharpEditor::GodotSharpEditor(EditorNode *p_editor) {
 		about_label->set_v_size_flags(Control::SIZE_EXPAND_FILL);
 		about_label->set_autowrap(true);
 		String about_text =
-				String("C# support in Godot Engine is a brand new feature and a work in progress.\n") +
-				"It is currently in an alpha stage and is not suitable for use in production.\n\n" +
-				"As of Godot 3.1, C# support is not feature-complete and may crash in some situations. " +
-				"Bugs and usability issues will be addressed gradually over future 3.x releases, " +
-				"including compatibility breaking changes as new features are implemented for a better overall C# experience.\n\n" +
-				"If you experience issues with this Mono build, please report them on Godot's issue tracker with details about your system, Mono version, IDE, etc:\n\n" +
+				String("C# support in Godot Engine is in late alpha stage and, while already usable, ") +
+				"it is not meant for use in production.\n\n" +
+				"Projects can be exported to Linux, macOS and Windows, but not yet to mobile or web platforms. " +
+				"Bugs and usability issues will be addressed gradually over future releases, " +
+				"potentially including compatibility breaking changes as new features are implemented for a better overall C# experience.\n\n" +
+				"If you experience issues with this Mono build, please report them on Godot's issue tracker with details about your system, MSBuild version, IDE, etc.:\n\n" +
 				"        https://github.com/godotengine/godot/issues\n\n" +
 				"Your critical feedback at this stage will play a great role in shaping the C# support in future releases, so thank you!";
 		about_label->set_text(about_text);