DOCSP-15078 clarify that out to json writes extended JSON always (#133)

Author: kanchana-mongodb

source/reference/pipeline/out.txt

@@ -213,12 +213,15 @@ Fields
              - ``bson.gz``
              - ``csv``
              - ``csv.gz``
-             - ``json``
-             - ``json.gz``
+             - ``json`` :sup:`1`
+             - ``json.gz`` :sup:`1`
              - ``parquet``
              - ``tsv``
              - ``tsv.gz``
 
+             :sup:`1` For this format, |out| writes data in 
+             :manual:`MongoDB Extended JSON </reference/mongodb-extended-json/>` format.
+
              .. seealso:: 
 
                 :ref:`Limitations <adl-out-stage-limitations>` 

source/supported-unsupported/supported-data-formats.txt

@@ -31,12 +31,12 @@ Supported Data Formats
      - - `snappy <http://google.github.io/snappy/>`__
        - `zlib <https://zlib.net/>`__
 
-   * - |json| 
+   * - |json| :sup:`1`
      - - `gzip <https://www.gnu.org/software/gzip/manual/gzip.html>`__ 
        - `bzip2 <https://www.sourceware.org/bzip2/>`__
 
    * - :manual:`MongoDB Extended JSON 
-       </reference/mongodb-extended-json/>` 
+       </reference/mongodb-extended-json/>` :sup:`1`
      - - `gzip <https://www.gnu.org/software/gzip/manual/gzip.html>`__ 
        - `bzip2 <https://www.sourceware.org/bzip2/>`__