trawl typos with aspell
diff --git a/examples/tracing/bitehist_example.txt b/examples/tracing/bitehist_example.txt
index f908264..90bbdf7 100644
--- a/examples/tracing/bitehist_example.txt
+++ b/examples/tracing/bitehist_example.txt
@@ -21,5 +21,5 @@
4 and 7 Kbytes in size.
Understanding this distribution is useful for characterizing workloads and
-understanding performance. The existance of this distribution is not visible
+understanding performance. The existence of this distribution is not visible
from averages alone.