CI: Show ipython directive errors (pandas-dev#36863)

Author: dsaxton

.github/workflows/ci.yml

@@ -125,7 +125,7 @@ jobs:
     # This can be removed when the ipython directive fails when there are errors,
     # including the `tee sphinx.log` in te previous step (https://github.com/ipython/ipython/issues/11547)
     - name: Check ipython directive errors
-      run: "! grep -B1 \"^<<<-------------------------------------------------------------------------$\" sphinx.log"
+      run: "! grep -B10 \"^<<<-------------------------------------------------------------------------$\" sphinx.log"
 
     - name: Install ssh key
       run: |