doc/go1.16: reword ambiguously parsable sentence

Change-Id: Idc54967e962352a598c9d4c563d1d9f51ec5c889
Reviewed-on: https://go-review.googlesource.com/c/go/+/285680
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.16.html

@@ -461,10 +461,10 @@ <h3 id="fs">File Systems</h3>
 
 <p>
   The new <a href="/pkg/io/fs/"><code>io/fs</code></a> package
-  defines an abstraction for read-only trees of files,
-  the <a href="/pkg/io/fs/#FS"><code>fs.FS</code></a> interface,
-  and the standard library packages have
-  been adapted to make use of the interface as appropriate.
+  defines the <a href="/pkg/io/fs/#FS"><code>fs.FS</code></a> interface,
+  an abstraction for read-only trees of files.
+  The standard library packages have been adapted to make use
+  of the interface as appropriate.
 </p>
 
 <p>