compat fix

Author: rustagir

source/includes/language-compatibility-table-ruby.rst

@@ -15,7 +15,7 @@
      - JRuby 9.2
      - JRuby 9.1
 
-   * - 2.22
+   * - 2.21.1
      - ✓
      - ✓
      - ✓
@@ -27,7 +27,7 @@
      - D
      -
 
-   * - 2.20 to 2.21
+   * - 2.20 to 2.21.0
      -
      - ✓
      - ✓