add E release document

Signed-off-by: weichen <niweichen@chinamobile.com>
Change-Id: I4f5ec7f559ff9ce9461737e9a0a306de157ca093
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index f4eec8e..b5fa610 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -29,7 +29,7 @@
 | 2020-12-21         | Cherry             | CMCC               | Cherry Release     |
 |                    |                    |                    |                    |
 +--------------------+--------------------+--------------------+--------------------+
-| 2021-07-15         | Dawn 	          | CMCC               | Dawn Release       |
+| 2021-07-15         | D	          | CMCC               | D Release          |
 |                    |                    |                    |                    |
 +--------------------+--------------------+--------------------+--------------------+
 | 2021-12-15         | E 	          | CMCC               | E Release          |