Coding standards part and bad empty Disallow

- Unsure PHP_EOL is the best here : PHP_EOL are not the same on *nux and win, it's not for server , but for browser
- _content vs _init : seems not really a web content ?

mod/robots_txt.php

@@ -1,27 +1,25 @@
 <?php
 /**
  * return the default robots.txt
- * @version 0.1.0
+ * @version 0.1.1
  */
 
 /**
  * Simple robots.txt
- * @inheritdoc (?)
+ * @param App $a
+ * @return void
  */
 function robots_txt_init(App $a) {
 
 	/** @var string[] globally disallowed url */
-    $allDisalloweds=array(
-        '/settings/',
-        '/admin/',
-        '/message/',
+	$allDisalloweds = array(
+		"/settings/",
+		"/admin/",
+		"/message/",
 	);
 
 	header("Content-Type: text/plain");
 	echo "User-agent: *\n";
-    echo "Disallow:\n";
-    echo "\n";
-    echo "User-agent: *\n";
 	foreach($allDisalloweds as $disallowed) {
 		echo "Disallow: {$disallowed}\n";
 	}