docs: Fix a PDF build error in bug-bisect.rst

It seems we can't have literal blocks in footnotes, which almost actually
makes some sense.  So just use basic ``monospace`` instead.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/admin-guide/bug-bisect.rst b/Documentation/admin-guide/bug-bisect.rst
index 5682d74..59567da 100644
--- a/Documentation/admin-guide/bug-bisect.rst
+++ b/Documentation/admin-guide/bug-bisect.rst
@@ -66,9 +66,7 @@
 
 
 .. [#f1] You can, optionally, provide both good and bad arguments at git
-	 start::
-
-		git bisect start [BAD] [GOOD]
+	 start with ``git bisect start [BAD] [GOOD]``
 
 For further references, please read: