Remove recipe_check_obs.yml from list of broken recipes (#4376)

Author: schlunma

doc/sphinx/source/recipes/broken_recipe_list.rst

@@ -17,11 +17,6 @@ More details can be found in the :ref:`broken recipe policy
      - Broken since release
      - Problem
      - GitHub issue
-   * - ``recipe_check_obs.yml``
-     - All
-     - v2.12.0
-     - Various missing datasets
-     - :issue:`3939`
    * - ``recipe_kcs.yml``
      - ``kcs/local_resampling.py``
      - v2.14.0