Add a note on how to run astyle (#500)

df7cb · web-flow · commit 7e633b84366c · 2025-11-25T07:40:49.000+01:00
This was previously only documented inside the github action.
diff --git a/tools/astylerc b/tools/astylerc
@@ -1,4 +1,6 @@
 # astylerc--custom options for Tlf
+# run with:
+# astyle --formatted --options=tools/astylerc src/*.[ch]
 
 # K&R style formatting/indenting with some tweaks.
 style=attach
