docs/DEBUGGING.md: use an underscore in the kernel command line option

systemd-debug-generator(8) lists it as `systemd.debug_shell`.

According to 1d84ad944520fc3e062ef518c4db4e1d3a1866af, kernel command
line options should use an underscore instead of a dash.

diff --git a/docs/DEBUGGING.md b/docs/DEBUGGING.md
index 3e89a5d8a4a8296a1fb2992db800ddac31331312..175e557e6c766d1dfad064c2b2a226bdc9c3f812 100644 (file)
--- a/docs/DEBUGGING.md
+++ b/docs/DEBUGGING.md
@@ -93,7 +93,7 @@ systemctl enable debug-shell.service
 or by specifying
 
 ```sh
-systemd.debug-shell=1
+systemd.debug_shell=1
 ```
 
 on the kernel command line.