Update version and stable symlink to 2.2 (#1564)

Author: svekars

docs/stable

@@ -1 +1 @@
-2.1
+2.2

docs/versions.html

@@ -21,10 +21,10 @@ <h1> PyTorch Documentation </h1>
           <a class="reference internal" href="main/">main (unstable)</a>
         </li>
         <li class="toctree-l1">
-          <a class="reference internal" href="2.2/">v2.2.0 (release candidate)</a>
+          <a class="reference internal" href="2.2/">v2.2.0 (stable)</a>
         </li>
         <li class="toctree-l1">
-          <a class="reference internal" href="2.1/">v2.1.0 (stable release)</a>
+          <a class="reference internal" href="2.1/">v2.1.0</a>
         </li>
         <li class="toctree-l1">
           <a class="reference internal" href="2.0/">v2.0.0</a>