Documentation: android: binderfs: add 'stats' mount option

Add documentation of the binderfs 'stats' mount option.

Description taken from the commit message.

Signed-off-by: Randy Dunlap <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

Author: rddunlap

Documentation/admin-guide/binderfs.rst

@@ -33,6 +33,12 @@ max
   a per-instance limit. If ``max=<count>`` is set then only ``<count>`` number
   of binder devices can be allocated in this binderfs instance.
 
+stats
+  Using ``stats=global`` enables global binder statistics.
+  ``stats=global`` is only available for a binderfs instance mounted in the
+  initial user namespace. An attempt to use the option to mount a binderfs
+  instance in another user namespace will return a permission error.
+
 Allocating binder Devices
 -------------------------