update compat

Author: mongoKart

source/includes/mongodb-compatibility-table-php.rst

@@ -13,14 +13,24 @@
      - MongoDB 4.0
      - MongoDB 3.6
 
+   * - ext + lib 2.1
+     - ✓
+     - ✓
+     - ✓
+     - ✓
+     - ✓
+     - ✓
+     -
+     -
+
    * - ext + lib 1.21 to 2.0
      - ✓
      - ✓
      - ✓
      - ✓
      - ✓
      - ✓
-     - ✓ [#deprecation-note]_
+     - ✓
      -
 
    * - ext + lib 1.20
@@ -52,5 +62,3 @@
      - ✓
      - ✓
      - ✓
-
-.. [#deprecation-note] Support for this MongoDB version is deprecated and will be removed in a future release.