Added Documentation for container_layer for empty_dirs (bazelbuild#1237)

* Added documentation for empty_dirs on container_layer

* Revert "Added documentation for empty_dirs on container_layer"

This reverts commit ea59351.

* Added empty_dirs documentation to container_layer

* Added extra period

README.md

@@ -1542,7 +1542,7 @@ configuration. See [here](#container_push-custom-client-configuration) for detai
 ## container_layer
 
 ```python
-container_layer(data_path, directory, files, mode, tars, debs, symlinks, env)
+container_layer(data_path, directory, empty_dirs, files, mode, tars, debs, symlinks, env)
 ```
 
 A rule that assembles data into a tarball which can be use as in `layers` attr in `container_image` rule.
@@ -1615,6 +1615,16 @@ A rule that assembles data into a tarball which can be use as in `layers` attr i
         </p>
       </td>
     </tr>
+    <tr>
+      <td><code>empty_dirs</code></td>
+      <td>
+        <code>List of directories, optional</code>
+        <p>Directory to add to the layer.</p>
+        <p>
+          A list of empty directories that should be created in the Docker image.
+        </p>
+      </td>
+    </tr>
     <tr>
       <td><code>files</code></td>
       <td>