samples: Kconfig: fix spelling mistake "instancess" -> "instances"

There is a spelling mistake in the SAMPLE_TRACE_ARRAY config. Fix it.

Link: https://lkml.kernel.org/r/20250724111715.141826-1-colin.i.king@gmail.com
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: ColinIanKing

samples/Kconfig

@@ -54,7 +54,7 @@ config SAMPLE_FTRACE_OPS
 	  measures the time taken to invoke one function a number of times.
 
 config SAMPLE_TRACE_ARRAY
-        tristate "Build sample module for kernel access to Ftrace instancess"
+        tristate "Build sample module for kernel access to Ftrace instances"
 	depends on EVENT_TRACING && m
 	help
 	 This builds a module that demonstrates the use of various APIs to