docs: fix the note rendering for DataFrames methods: nlargest, nsmallest (#417)

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://togithub.com/googleapis/python-bigquery-dataframes/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes internal issue #328445384 🦕

Author: ashleyxuu

third_party/bigframes_vendored/pandas/core/frame.py

@@ -3935,6 +3935,11 @@ def nlargest(self, n: int, columns, keep: str = "first"):
         ``df.sort_values(columns, ascending=False).head(n)``, but more
         performant.
 
+        .. note::
+            This function cannot be used with all column types. For example, when
+            specifying columns with `object` or `category` dtypes, ``TypeError`` is
+            raised.
+
         **Examples:**
 
             >>> import bigframes.pandas as bpd
@@ -4002,11 +4007,6 @@ def nlargest(self, n: int, columns, keep: str = "first"):
 
         Returns:
             DataFrame: The first `n` rows ordered by the given columns in descending order.
-
-        .. note::
-            This function cannot be used with all column types. For example, when
-            specifying columns with `object` or `category` dtypes, ``TypeError`` is
-            raised.
         """
         raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
 
@@ -4022,6 +4022,12 @@ def nsmallest(self, n: int, columns, keep: str = "first"):
         ``df.sort_values(columns, ascending=True).head(n)``, but more
         performant.
 
+        .. note::
+
+            This function cannot be used with all column types. For example, when
+            specifying columns with `object` or `category` dtypes, ``TypeError`` is
+            raised.
+
         **Examples:**
 
             >>> import bigframes.pandas as bpd
@@ -4090,11 +4096,6 @@ def nsmallest(self, n: int, columns, keep: str = "first"):
 
         Returns:
             DataFrame: The first `n` rows ordered by the given columns in ascending order.
-
-        .. note::
-            This function cannot be used with all column types. For example, when
-            specifying columns with `object` or `category` dtypes, ``TypeError`` is
-            raised.
         """
         raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)