Help: Add notes for topic 'fix-bison-flex-command-escaping'

Help/release/dev/fix-bison-flex-command-escaping.rst

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+fix-bison-flex-command-escaping
+-------------------------------
+
+* The :module:`FindBISON` module ``BISON_TARGET`` macro now supports
+  special characters by passing the ``VERBATIM`` option to internal
+  :command:`add_custom_command` calls.  This may break clients that
+  added escaping manually to work around the bug.
+
+* The :module:`FindFLEX` module ``FLEX_TARGET`` macro now supports
+  special characters by passing the ``VERBATIM`` option to internal
+  :command:`add_custom_command` calls.  This may break clients that
+  added escaping manually to work around the bug.