Documentation: i2c: slave: give proper example for pm usage

pm_runtime_forbid was the wrong knob, this is the better one.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/Documentation/i2c/slave-interface b/Documentation/i2c/slave-interface
index abd1018..80807ad 100644
--- a/Documentation/i2c/slave-interface
+++ b/Documentation/i2c/slave-interface
@@ -139,9 +139,9 @@
 * implement calls to register/unregister the slave and add those to the
   struct i2c_algorithm. When registering, you probably need to set the i2c
   slave address and enable slave specific interrupts. If you use runtime pm, you
-  should use pm_runtime_forbid() because your device usually needs to be powered
-  on always to be able to detect its slave address. When unregistering, do the
-  inverse of the above.
+  should use pm_runtime_get_sync() because your device usually needs to be
+  powered on always to be able to detect its slave address. When unregistering,
+  do the inverse of the above.
 
 * Catch the slave interrupts and send appropriate i2c_slave_events to the backend.