fix formatting mistakes in config file warning code block

Co-authored-by: A Thousand Ships <96648715+AThousandShips@users.noreply.github.com>

doc/classes/ConfigFile.xml

@@ -164,15 +164,16 @@
 			<description>
 				Loads the config file specified as a parameter. The file's contents are parsed and loaded in the [ConfigFile] object which the method was called on.
 				Returns [constant OK] on success, or one of the other [enum Error] values if the operation failed.
-				[b]Warning:[/b] Loading Data from a Config File may allow for remote code execution. This is non-trivial to midigate, but storing a [readme] file in the same directory can warn users against downloading untrusted configurations:
+				[b]Warning:[/b] Loading Data from a Config File may allow for remote code execution. This is non-trivial to midigate, but storing a [code]readme[/code] file in the same directory can warn users against downloading untrusted configurations:
 				[codeblocks]
 				[gdscript]
 				var config_path = "user://"
 				var config_file_name = "my_game.config"
-				# check if configuration has been initialized:
+				# Check if configuration has been initialized:
 				if not FileAccess.file_exists("%s%s" % [config_path, config_file_name]):
-					var readme := FileAccess.open("%s%s" % [config_path, "README.txt"], FileAccess.WRITE)
-					readme.store_string("Caution: It is not advised to use Config-files you find online, as malicious files may compromise your device. ")
+				    var readme = FileAccess.open("%s%s" % [config_path, "README.txt"], FileAccess.WRITE)
+				    readme.store_string("Caution: It is not advised to use Config-files you find online, as malicious files may compromise your device.")
+				    readme.close()
 				[/gdscript]
 				[/codeblocks]
 			</description>