perf tools: Fix duplicated words in documentation and comments

- "the the"
- "in in"
- "a a"

Reviewed-by: Ian Rogers <[e-mail]>
Signed-off-by: Markus Heidelberg <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Documentation/perf-diff.txt

···
 
   - period being the hist entry period value
 
-  - WEIGHT-A/WEIGHT-B being user supplied weights in the the '-c' option
+  - WEIGHT-A/WEIGHT-B being user supplied weights in the '-c' option
     behind ':' separator like '-c wdiff:1,2'.
     - WEIGHT-A being the weight of the data file
     - WEIGHT-B being the weight of the baseline data file

tools/perf/builtin-script.c

···
 	OUTPUT_TYPE_MAX
 };
 
-// We need to refactor the evsel->priv use in in 'perf script' to allow for
+// We need to refactor the evsel->priv use in 'perf script' to allow for
 // using that area, that is being used only in some cases.
 #define OUTPUT_TYPE_UNSET -1
 

tools/perf/util/hwmon_pmu.h

···
 /**
  * enum hwmon_item:
  *
- * Similar to enum hwmon_type but describes the item part of a a sysfs filename.
+ * Similar to enum hwmon_type but describes the item part of a sysfs filename.
  *
  * This enum is exposed for testing.
  */