Help: Add notes for topic 'fortran-submodules'

Help/release/dev/fortran-submodules.rst

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+fortran-submodules
+------------------
+
+* The Fortran dependency scanner learned to support the syntax of
+  `Fortran Submodules`_.
+
+.. _`Fortran Submodules`: http://fortranwiki.org/fortran/show/Submodules