Merge pull request #66122 from raulsntos/dotnet/FirAccess🌲-docs

Improve C# documentation for FileAccess and DirAccess

doc/classes/DirAccess.xml

@@ -27,7 +27,7 @@
 		[csharp]
 		public void DirContents(string path)
 		{
-		    var dir = DirAccess.Open(path);
+		    using var dir = DirAccess.Open(path);
 		    if (dir != null)
 		    {
 		        dir.ListDirBegin();

doc/classes/FileAccess.xml

@@ -20,24 +20,30 @@
 		[csharp]
 		public void Save(string content)
 		{
-		    var file = FileAccess.Open("user://save_game.dat", File.ModeFlags.Write);
+		    using var file = FileAccess.Open("user://save_game.dat", File.ModeFlags.Write);
 		    file.StoreString(content);
 		}
 
 		public string Load()
 		{
-		    var file = FileAccess.Open("user://save_game.dat", File.ModeFlags.Read);
+		    using var file = FileAccess.Open("user://save_game.dat", File.ModeFlags.Read);
 		    string content = file.GetAsText();
 		    return content;
 		}
 		[/csharp]
 		[/codeblocks]
 		In the example above, the file will be saved in the user data folder as specified in the [url=$DOCS_URL/tutorials/io/data_paths.html]Data paths[/url] documentation.
-		There is no method to close a file in order to free it from use. Instead, [FileAccess] will close when it's freed, which happens when it goes out of scope or when it gets assigned with [code]null[/code].
-		[codeblock]
+		There is no method to close a file in order to free it from use. Instead, [FileAccess] will close when it's freed, which happens when it goes out of scope or when it gets assigned with [code]null[/code]. In C# the reference must be disposed after we are done using it, this can be done with the [code]using[/code] statement or calling the [code]Dispose[/code] method directly.
+		[codeblocks]
+		[gdscript]
 		var file = FileAccess.open("res://something") # File is opened and locked for use.
 		file = null # File is closed.
-		[/codeblock]
+		[/gdscript]
+		[csharp]
+		using var file = FileAccess.Open("res://something"); // File is opened and locked for use.
+		// The using statement calls Dispose when going out of scope.
+		[/csharp]
+		[/codeblocks]
 		[b]Note:[/b] To access project resources once exported, it is recommended to use [ResourceLoader] instead of the [FileAccess] API, as some files are converted to engine-specific formats and their original source files might not be present in the exported PCK package.
 		[b]Note:[/b] Files are automatically closed only if the process exits "normally" (such as by clicking the window manager's close button or pressing [b]Alt + F4[/b]). If you stop the project execution by pressing [b]F8[/b] while the project is running, the file won't be closed as the game process will be killed. You can work around this by calling [method flush] at regular intervals.
 	</description>