tools/perf: Fix misspellings in comments.

Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 4c19d5e..696e8da 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1649,7 +1649,7 @@
 
 		buf = _buf;
 
-		/* We're cutting from the beggining. */
+		/* We're cutting from the beginning. */
 		if (err->idx > max_err_idx)
 			cut = err->idx - max_err_idx;