title: Psalm multiline associative array annotation
body: <p>I'm using Psalm style annotations to document for instance return array types, such:</p>
  <pre class="lang-php prettyprint-override"><code>/**
    * @return array{ key1: type1, key2: type2, key3: array{ nestedKey1: array&lt;string,string&gt; } }
    */
  </code></pre>
  <p>This works like a charm for autocomplete / static analysis, including PhpStorm. However, these lines can get just absurly long and impossible to follow, especially where nested arrays are involved.</p>
  <p>I'm looking for a multiline syntax for this annotation, where I can have something like:</p>
  <pre class="lang-php prettyprint-override"><code>/**
    * @return array{ 
    *    key1: type1, 
    *    key2: type2, 
    *    key3: array{ 
    *      nestedKey1: array&lt;string,string&gt; 
    *    } 
    *  }
    */
  </code></pre>
  <p>However as it's written this doesn't appear to be valid parsed syntax. Is there some syntax that would allow me to break the definition on multiple lines?</p>