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Added small doc page for DOCKER_INDEX_URL variable

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      docs/sources/index/variable.rst

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docs/sources/index/variable.rst

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+=================================
+Docker Index Environment Variable
+=================================
+
+Variable
+--------
+
+.. code-block:: sh
+
+    DOCKER_INDEX_URL
+
+Setting this environment variable on the docker server will change the URL docker index.
+This address is used in commands such as ``docker login``, ``docker push`` and ``docker pull``.
+The docker daemon doesn't need to be restarted for this parameter to take effect.
+
+Example
+-------
+
+.. code-block:: sh
+
+    docker -d &
+    export DOCKER_INDEX_URL="https://index.docker.io"
+