Add dev notes for topic 'curl_netrc_options'

Help/release/dev/curl_netrc_options.rst

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+curl_netrc_options
+------------------
+
+* The :command:`file(DOWNLOAD)` and :command:`file(UPLOAD)` commands
+  gained ``NETRC`` and ``NETRC_FILE`` options to specify use of a
+  ``.netrc`` file.
+
+* The :module:`ExternalProject` module gained ``NETRC`` and ``NETRC_FILE``
+  options to specify use of a ``.netrc`` file.
+
+* The :variable:`CMAKE_NETRC` and :variable:`CMAKE_NETRC_FILE` variables
+  were added to specify use of a ``.netrc`` file by the
+  :command:`file(DOWNLOAD)` and :command:`file(UPLOAD)` commands and
+  the :module:`ExternalProject` module.