Add note for the NSDIC cmoriser (requires PROJ9.3) see SciTools/iris#5343

Author: rbeucher

doc/sphinx/source/input.rst

@@ -393,7 +393,7 @@ A list of the datasets for which a CMORizers is available is provided in the fol
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
 | NOAAGlobalTemp               | tasa (Amon)                                                                                          |   2  | Python          |
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
-| NSIDC-0116-[nh|sh]           | usi, vsi (day)                                                                                       |   3  | Python          |
+| NSIDC-0116-[nh|sh] [#note4]_ | usi, vsi (day)                                                                                       |   3  | Python          |
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
 | OceanSODA-ETHZ               | areacello (Ofx), co3os, dissicos, fgco2, phos, spco2, talkos (Omon)                                  |   2  | Python          |
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
@@ -433,6 +433,10 @@ A list of the datasets for which a CMORizers is available is provided in the fol
             can be found in the corresponding section of `recipe_check_obs.yml
             <https://github.com/ESMValGroup/ESMValTool/blob/main/esmvaltool/recipes/examples/recipe_check_obs.yml>`__.
 
+.. [#note4] The cmoriser requires PROJ>=9.3. Previous version of PROJ will return an error:
+            ``Internal Proj Error: proj_create: unhandled axis direction: UNKNOWN)
+            You can check the version of PROJ in your conda environment by running:
+            ``conda list PROJ``.
 
 .. _inputdata_native_datasets: