[PATCH v7 58/59] perf python: Improve perf script -l descriptions

[Ian Rogers <irogers@google.com>]

Improve the description when running "perf script -l":
```
$ perf script -l
List of available scripts:
...
  counting                             Example for counting perf events.
...
  exported-sql-viewer                  exported-sql-viewer.py: view data from sql database.
...
  tracepoint                           Example showing how to enable a tracepoint and access its fields.
  twatch                               Example to show how to enable a tracepoint and access its fields.
...
```

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/python/counting.py            | 1 +
 tools/perf/python/exported-sql-viewer.py | 2 +-
 tools/perf/python/tracepoint.py          | 1 +
 tools/perf/python/twatch.py              | 1 +
 4 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/python/counting.py b/tools/perf/python/counting.py
index 02121d2bb11d..9adbbeccdacd 100755
--- a/tools/perf/python/counting.py
+++ b/tools/perf/python/counting.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: GPL-2.0
+"""Example for counting perf events."""
 # -*- python -*-
 # -*- coding: utf-8 -*-
 
diff --git a/tools/perf/python/exported-sql-viewer.py b/tools/perf/python/exported-sql-viewer.py
index f3ac96ada1f5..6d526a2502ca 100755
--- a/tools/perf/python/exported-sql-viewer.py
+++ b/tools/perf/python/exported-sql-viewer.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # SPDX-License-Identifier: GPL-2.0
-# exported-sql-viewer.py: view data from sql database
+"""exported-sql-viewer.py: view data from sql database."""
 # Copyright (c) 2014-2018, Intel Corporation.
 
 # To use this script you will need to have exported data using either the
diff --git a/tools/perf/python/tracepoint.py b/tools/perf/python/tracepoint.py
index 15b0c8268996..d3bc22628ef7 100755
--- a/tools/perf/python/tracepoint.py
+++ b/tools/perf/python/tracepoint.py
@@ -1,5 +1,6 @@
 #! /usr/bin/env python
 # SPDX-License-Identifier: GPL-2.0
+"""Example showing how to enable a tracepoint and access its fields."""
 # -*- python -*-
 # -*- coding: utf-8 -*-
 
diff --git a/tools/perf/python/twatch.py b/tools/perf/python/twatch.py
index 04f3db29b9bc..e50cc2feb58a 100755
--- a/tools/perf/python/twatch.py
+++ b/tools/perf/python/twatch.py
@@ -1,5 +1,6 @@
 #! /usr/bin/env python
 # SPDX-License-Identifier: GPL-2.0-only
+"""Example to show how to enable a tracepoint and access its fields."""
 # -*- python -*-
 # -*- coding: utf-8 -*-
 #   twatch - Experimental use of the perf python interface
-- 
2.54.0.545.g6539524ca2-goog