Tweaked research topic descriptions

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@@ -59,7 +59,7 @@
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-                                <b>Out-of-Distribution Generalization (primary)</b>
+                                <b>Out-of-Distribution Generalization</b>
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                                     <li>
                                         Average-case robustness to <a href="https://arxiv.org/pdf/1903.12261">common corruptions</a> in image classification