Fixed a typo in the voltha release notes image, dot-dot truncated to dot

Change-Id: I4de322c1f9a7a1dd8b221ccd4cee84415ab67674
diff --git a/release_notes/voltha_2.11.rst b/release_notes/voltha_2.11.rst
index af60c17..2ad120c 100644
--- a/release_notes/voltha_2.11.rst
+++ b/release_notes/voltha_2.11.rst
@@ -1,4 +1,4 @@
-. figure:: images/voltha.svg
+.. figure:: images/voltha.svg
    :alt: voltha- Release Notes
    :width: 40%
    :align: center