DOCS-7775 Update compatibility matrix for 2.3

Author: estolfo

docs/reference/driver-compatibility.txt

@@ -25,6 +25,12 @@ MongoDB Compatibility
      - MongoDB 3.0
      - MongoDB 3.2
 
+   * - 2.3
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+
    * - 2.2
      - |checkmark|
      - |checkmark|
@@ -86,6 +92,8 @@ Language Compatibility
      - Ruby 1.9
      - Ruby 2.0
      - Ruby 2.1
+     - Ruby 2.2
+     - Ruby 2.3
      - JRuby
 
    * - 2.0
@@ -94,33 +102,43 @@ Language Compatibility
      - |checkmark|
      - |checkmark|
      - |checkmark|
+     - |checkmark|
+     - |checkmark|
 
    * - 1.12 - 1.9
      - |checkmark|
      - |checkmark|
      - |checkmark|
      - |checkmark|
+     -
+     -
      - |checkmark|
 
    * - 1.8
      - |checkmark|
      - |checkmark|
      - |checkmark|
      -
+     -
+     -
      - |checkmark|
 
    * - 1.7
      - |checkmark|
      - |checkmark|
      -
      -
+     -
+     -
      - |checkmark|
 
    * - 1.6
      - |checkmark|
      - |checkmark|
      -
      -
+     -
+     -
      - |checkmark|
 
 .. include:: /includes/unicode-checkmark.rst