move stable to point to 1.8.0

Author: mattip

docs/stable

@@ -1 +1 @@
-1.7.1
+1.8.0

docs/versions.html

@@ -21,10 +21,10 @@ <h1> PyTorch Documentation </h1>
           <a class="reference internal" href="master/">master (unstable)</a>
         </li>
         <li class="toctree-l1">
-          <a class="reference internal" href="1.8.0/">v1.8.0 (release candidate)</a>
+          <a class="reference internal" href="1.8.0/">v1.8.0 (stable release)</a>
         </li>
         <li class="toctree-l1">
-          <a class="reference internal" href="1.7.1/">v1.7.1 (stable release)</a>
+          <a class="reference internal" href="1.7.1/">v1.7.1</a>
         </li>
         <li class="toctree-l1">
           <a class="reference internal" href="1.7.0/">v1.7.0</a>