Add the list of the currently implemented extra tags to the `replace_extra_tags` documentation.

src/main.rs

@@ -69,6 +69,11 @@ fn get_file_list(path: &str, wildcard: &str) -> Vec<String> {
 
 /// Replaces extra tags in the `new file_name` with corresponding values from the `original_file_name`.
 ///
+/// Extra tags:
+/// * {full_name} - file name with extension
+/// * {name} - file name without extension
+/// * {ext} - extension
+///
 /// # Arguments
 ///
 /// * `original_file_name` - The original name of the file.