fix line break

Author: ncclementi

docs/cudf/source/cudf_pandas/usage.md

@@ -27,7 +27,9 @@ df.apply(list, axis=1)                # uses the CPU (fallback)
 ```
 
 ```{note}
-If you have already imported or used pandas in your current kernel session, you will need to restart your kernel and run `%load_ext cudf.pandas` as the first command before any pandas imports or usage.
+If you have already imported or used pandas in your current kernel session,
+you will need to restart your kernel and run `%load_ext cudf.pandas` as the
+first command before any pandas imports or usage.
 ```
 
 ## Command Line Usage