DOC: Add return value for Index.slice_locs when label not found pandas-dev#32680 (pandas-dev#58135)

* add return value if non-existent label is provided in pandas.Index.slice_locs

* fix Line too long error

* remove trailing whitespace

* fix double line break

* writing as example instead of note

Author: KeiOshima

pandas/core/indexes/base.py

@@ -6434,6 +6434,10 @@ def slice_locs(self, start=None, end=None, step=None) -> tuple[int, int]:
         >>> idx = pd.Index(list("abcd"))
         >>> idx.slice_locs(start="b", end="c")
         (1, 3)
+
+        >>> idx = pd.Index(list("bcde"))
+        >>> idx.slice_locs(start="a", end="c")
+        (0, 2)
         """
         inc = step is None or step >= 0