doc: minor fixes

doc/chapters/configuration.texi

@@ -210,7 +210,7 @@ Enable performance model debugging.
 
 @defvr {Configure option} --enable-stats
 @c see ../../src/datawizard/datastats.c
-Enable gathering of memory transfer statistics.
+Enable gathering of various data statistics.
 @end defvr
 
 @defvr {Configure option} --enable-maxbuffers

doc/chapters/perf-feedback.texi

@@ -500,7 +500,7 @@ Node #3
 
 Different statistics can be displayed at the end of the execution of
 the application. To enable them, you need to pass the option
-@code{--enable-statistics} when calling @code{configure} and/or set
+@code{--enable-stats} when calling @code{configure} and/or set
 the environment variables @code{STARPU_BUS_STATS} and
 @code{STARPU_WORKER_STATS} when calling your application.