doc:locking: fix locktorture parameter description

The description was talking about two default values: I removed the
wrong one.

Signed-off-by: Federico Vaga <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/locking/locktorture.rst

···
 		  Number of seconds between statistics-related printk()s.
 		  By default, locktorture will report stats every 60 seconds.
 		  Setting the interval to zero causes the statistics to
-		  be printed -only- when the module is unloaded, and this
-		  is the default.
+		  be printed -only- when the module is unloaded.
 
 stutter
 		  The length of time to run the test before pausing for this