feat!: update support policy for node8 and node10 notice (#249)

BREAKING CHANGE: Deprecate Node8 and Node10

Author: josecorella

SUPPORT_POLICY.rst

@@ -25,9 +25,9 @@ This table describes the current support status of each major version of the AWS
       - End of Support
       - 2022-04-15
     * - 2.x
-      - General Availability
-      -
       -
+      - General Availability
+      - 2021-10-21
 
 .. _AWS SDKs and Tools Maintenance Policy: https://docs.aws.amazon.com/sdkref/latest/guide/maint-policy.html#version-life-cycle