[PATCH 5/5] autoregen.py: Add introduction comment

[Christophe Lyon <christophe.lyon@linaro.org>]

To give more context to users, with the plan of moving this file to
contrib/ in binutils-gdb and gcc repositories.
---
 builder/containers/autoregen.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builder/containers/autoregen.py b/builder/containers/autoregen.py
index 277dcb7..c392bf8 100755
--- a/builder/containers/autoregen.py
+++ b/builder/containers/autoregen.py
@@ -1,5 +1,12 @@
 #!/usr/bin/env python3
 
+# This script helps to regenerate files managed by autotools and
+# autogen in binutils-gdb and gcc repositories.
+
+# In can be used by buildbots to check that the current repository
+# contents has been updated correctly, and by developers to update
+# such files as expected.
+
 import os
 import shutil
 import subprocess
-- 
2.34.1