Update text to target ideas dropdown

ideas/index.rst

@@ -16,7 +16,7 @@ and to automate things in the physical world.
 
 .. admonition:: How to participate?
 
-   Contributors are expected to go through the list of ideas below and join the discussion by clicking on the
+   Contributors are expected to go through the list of ideas dropdown below and join the discussion by clicking on the
    ``Discuss on forum`` button. All ideas have colorful badges for ``Complexity`` and
    ``Size`` for making the selection process easier for contributors. Anyone is welcome to
    introduce new ideas via the `forum gsoc-ideas tag <https://forum.beagleboard.org/tag/gsoc-ideas>`_.