Minor documentation tweaks to wp eval-file (#68)

* Update EvalFile_Command.php

1. Note that arguments are positional. 
2. Example is not visible in the docs. Fix formatting.

* Update EvalFile_Command.php

* Fix PHPCS errors

---------

Co-authored-by: Daniel Bachhuber <[email protected]>

Author: zzap

src/EvalFile_Command.php

@@ -23,7 +23,7 @@ class EvalFile_Command extends WP_CLI_Command {
 	 * : The path to the PHP file to execute.  Use '-' to run code from STDIN.
 	 *
 	 * [<arg>...]
-	 * : One or more arguments to pass to the file. They are placed in the $args variable.
+	 * : One or more positional arguments to pass to the file. They are placed in the $args variable.
 	 *
 	 * [--skip-wordpress]
 	 * : Load and execute file without loading WordPress.
@@ -35,7 +35,9 @@ class EvalFile_Command extends WP_CLI_Command {
 	 *
 	 * ## EXAMPLES
 	 *
-	 *     wp eval-file my-code.php value1 value2
+	 *     # Execute file my-code.php and pass value1 and value2 arguments.
+	 *     # Access arguments in $args array ($args[0] = value1, $args[1] = value2).
+	 *     $ wp eval-file my-code.php value1 value2
 	 */
 	public function __invoke( $args, $assoc_args ) {
 		$file = array_shift( $args );