Documentation search fixes

Updates rich_text_label so that the built-in documentation can be searched
Previously, it would only find the first result and would not select other results
Renames "_entered" functions to "_submitted"

editor/editor_properties.h

@@ -56,7 +56,7 @@ class EditorPropertyText : public EditorProperty {
 	bool updating;
 	bool string_name;
 	void _text_changed(const String &p_string);
-	void _text_entered(const String &p_string);
+	void _text_submitted(const String &p_string);
 
 protected:
 	static void _bind_methods();