Help: Add notes for topic 'UseSWIG-no-MAIN_DEPENDENCY'

Help/release/dev/UseSWIG-no-MAIN_DEPENDENCY.rst

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+UseSWIG-no-MAIN_DEPENDENCY
+--------------------------
+
+* The :module:`UseSWIG` module ``SWIG_ADD_MODULE`` macro no
+  longer attaches the swig invocation custom command to the
+  ``.i`` source file in IDE projects.  This is because only
+  one custom command can be safely attached to a given source
+  file, and adding multiple modules with the same ``.i`` file
+  for different languages requires more than one such command.