DOC: Clarify loc and iloc functionality in user_guide/indexing.html (#60501)

* Fix iloc wording error on indexing user guide page

* Update doc/source/user_guide/indexing.rst

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Co-authored-by: Matthew Roeschke <[email protected]>

Author: bluestarunderscore

doc/source/user_guide/indexing.rst

@@ -858,9 +858,10 @@ and :ref:`Advanced Indexing <advanced>` you may select along more than one axis
 
 .. warning::
 
-   ``iloc`` supports two kinds of boolean indexing. If the indexer is a boolean ``Series``,
-   an error will be raised. For instance, in the following example, ``df.iloc[s.values, 1]`` is ok.
-   The boolean indexer is an array. But ``df.iloc[s, 1]`` would raise ``ValueError``.
+   While ``loc`` supports two kinds of boolean indexing, ``iloc`` only supports indexing with a
+   boolean array. If the indexer is a boolean ``Series``, an error will be raised. For instance,
+   in the following example, ``df.iloc[s.values, 1]`` is ok. The boolean indexer is an array.
+   But ``df.iloc[s, 1]`` would raise ``ValueError``.
 
    .. ipython:: python