Fix StringName not documented for enum hint

Author: timothyqiu

doc/classes/@GlobalScope.xml

@@ -2780,11 +2780,11 @@
 			Additionally, other keywords can be included: [code]"exp"[/code] for exponential range editing, [code]"radians_as_degrees"[/code] for editing radian angles in degrees (the range values are also in degrees), [code]"degrees"[/code] to hint at an angle, [code]"prefer_slider"[/code] to show the slider for integers, and [code]"hide_control"[/code] to hide the slider or up-down arrows.
 		</constant>
 		<constant name="PROPERTY_HINT_ENUM" value="2" enum="PropertyHint">
-			Hints that an [int] or [String] property is an enumerated value to pick in a list specified via a hint string.
+			Hints that an [int], [String], or [StringName] property is an enumerated value to pick in a list specified via a hint string.
 			The hint string is a comma separated list of names such as [code]"Hello,Something,Else"[/code]. Whitespaces are [b]not[/b] removed from either end of a name. For integer properties, the first name in the list has value 0, the next 1, and so on. Explicit values can also be specified by appending [code]:integer[/code] to the name, e.g. [code]"Zero,One,Three:3,Four,Six:6"[/code].
 		</constant>
 		<constant name="PROPERTY_HINT_ENUM_SUGGESTION" value="3" enum="PropertyHint">
-			Hints that a [String] property can be an enumerated value to pick in a list specified via a hint string such as [code]"Hello,Something,Else"[/code].
+			Hints that a [String] or [StringName] property can be an enumerated value to pick in a list specified via a hint string such as [code]"Hello,Something,Else"[/code]. See [constant PROPERTY_HINT_ENUM] for details.
 			Unlike [constant PROPERTY_HINT_ENUM], a property with this hint still accepts arbitrary values and can be empty. The list of values serves to suggest possible values.
 		</constant>
 		<constant name="PROPERTY_HINT_EXP_EASING" value="4" enum="PropertyHint">

editor/inspector/editor_properties.cpp

@@ -3859,6 +3859,7 @@ EditorProperty *EditorInspectorDefaultPlugin::get_editor_for_property(Object *p_
 				Vector<String> options;
 				Vector<String> option_names;
 				if (p_hint_text.begins_with(";")) {
+					// This is not supported officially. Only for `interface/editor/editor_language`.
 					for (const String &option : p_hint_text.split(";", false)) {
 						options.append(option.get_slicec('/', 0));
 						option_names.append(option.get_slicec('/', 1));