doc/1.16: fix link to fs.FileInfo

Updates #40700

Change-Id: Ifff622ccadaa31c0c0684c3c695aadcaa2305623
Reviewed-on: https://go-review.googlesource.com/c/go/+/294669
Trust: Alberto Donizetti <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: ALTree

doc/go1.16.html

@@ -548,7 +548,7 @@ <h3 id="ioutil">Deprecation of io/ioutil</h3>
       (note: returns a slice of
       <a href="/pkg/os/#DirEntry"><code>os.DirEntry</code></a>
       rather than a slice of
-      <a href="/pkg/fs/#FileInfo"><code>fs.FileInfo</code></a>)
+      <a href="/pkg/io/fs/#FileInfo"><code>fs.FileInfo</code></a>)
     </li>
     <li><a href="/pkg/io/ioutil/#ReadFile"><code>ReadFile</code></a>
       => <a href="/pkg/os/#ReadFile"><code>os.ReadFile</code></a></li>