RR feedback

Author: mcmorisi

source/reference/driver-compatibility.txt

@@ -341,25 +341,7 @@ for that Ruby version is deprecated.
      - JRuby 9.2
      - JRuby 9.1
 
-   * - 2.21
-     - |checkmark|
-     - |checkmark|
-     - |checkmark|
-     - D
-     -
-     -
-     -
-     -
-     -
-     -
-     -
-     -
-     - |checkmark|
-     - |checkmark|
-     - D
-     -
-
-   * - 2.20
+   * - 2.20 to 2.21
      - |checkmark|
      - |checkmark|
      - |checkmark|