Fix Erroneous "gethostlatency" Comments (#2549)

* Fix erroneous comment in gethostlatency.py
* Fix erroneous comment in gethostlatency_example
diff --git a/tools/gethostlatency.py b/tools/gethostlatency.py
index 965c0db..f7506a8 100755
--- a/tools/gethostlatency.py
+++ b/tools/gethostlatency.py
@@ -21,7 +21,7 @@
 import argparse
 
 examples = """examples:
-    ./gethostlatency           # trace all TCP accept()s
+    ./gethostlatency           # time getaddrinfo/gethostbyname[2] calls
     ./gethostlatency -p 181    # only trace PID 181
 """
 parser = argparse.ArgumentParser(