docs: update calendar and link releases notes for 20.2.1

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7141>
diff --git a/docs/release-calendar.rst b/docs/release-calendar.rst
index 1a34b6f..a055e2a 100644
--- a/docs/release-calendar.rst
+++ b/docs/release-calendar.rst
@@ -32,9 +32,7 @@
 +========+===============+============+=================+=========================================+
 | 20.1   | 2020-10-14    | 20.1.10    | Eric Engestrom  | Last planned release of the 20.1 series |
 +--------+---------------+------------+-----------------+-----------------------------------------+
-| 20.2   | 2020-10-14    | 20.2.1     | Dylan Baker     |                                         |
-|        +---------------+------------+-----------------+-----------------------------------------+
-|        | 2020-10-28    | 20.2.2     | Dylan Baker     |                                         |
+| 20.2   | 2020-10-28    | 20.2.2     | Dylan Baker     |                                         |
 |        +---------------+------------+-----------------+-----------------------------------------+
 |        | 2020-11-11    | 20.2.3     | Dylan Baker     |                                         |
 |        +---------------+------------+-----------------+-----------------------------------------+
diff --git a/docs/relnotes.rst b/docs/relnotes.rst
index 6033b25..281c8e0 100644
--- a/docs/relnotes.rst
+++ b/docs/relnotes.rst
@@ -3,6 +3,7 @@
 
 The release notes summarize what's new or changed in each Mesa release.
 
+-  :doc:`20.2.1 release notes <relnotes/20.2.1>`
 -  :doc:`20.2.0 release notes <relnotes/20.2.0>`
 -  :doc:`20.1.9 release notes <relnotes/20.1.9>`
 -  :doc:`20.1.8 release notes <relnotes/20.1.8>`
@@ -316,6 +317,7 @@
    :maxdepth: 1
    :hidden:
 
+   relnotes/20.2.1
    relnotes/20.2.0
    relnotes/20.1.9
    relnotes/20.1.8