Update docs/examples/example_gridsearch.ipynb

Co-authored-by: Kevin Klein <[email protected]>

docs/examples/example_gridsearch.ipynb

@@ -238,7 +238,7 @@
    "metadata": {},
    "source": [
     "Now we can call {meth}`~metalearners.grid_search.MetaLearnerGridSearch.fit` with the train\n",
-    "and validation data and can inspect the results dataframe in ``results_``."
+    "and validation data and can inspect the results ``DataFrame`` in ``results_``."
    ]
   },
   {