tracing: fix grammar error in debugging.rst

Signed-off-by: Ryan Chung <[e-mail]>
Acked-by: Steven Rostedt (Google) <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/trace/debugging.rst

···
 crash occurs. This could be from the oops message in printk, or one could
 use kexec/kdump. But these just show what happened at the time of the crash.
 It can be very useful in knowing what happened up to the point of the crash.
-The tracing ring buffer, by default, is a circular buffer than will
+The tracing ring buffer, by default, is a circular buffer that will
 overwrite older events with newer ones. When a crash happens, the content of
 the ring buffer will be all the events that lead up to the crash.