Merge pull request pandas-dev#9238 from clham/GH8686

DOC: Small syntax change to indexing.rst to address GH8686.

Author: jorisvandenbossche

doc/source/indexing.rst

@@ -71,8 +71,7 @@ Object selection has had a number of user-requested additions in order to
 support more explicit location based indexing. pandas now supports three types
 of multi-axis indexing.
 
-- ``.loc`` is strictly label based, will raise ``KeyError`` when the items are
-  not found, allowed inputs are:
+- ``.loc`` is primarily label based, but may also be used with a boolean array. ``.loc`` will raise ``KeyError`` when the items are not found. Allowed inputs are:
 
   - A single label, e.g. ``5`` or ``'a'``, (note that ``5`` is interpreted as a
     *label* of the index. This use is **not** an integer position along the