Documentation: Add leading slash to some paths

Change multiple sys/xyz to /sys/xyz

Signed-off-by: Mark O'Donovan <shiftee@posteo.net>
Link: https://lore.kernel.org/r/20210328152837.73347-1-shiftee@posteo.net
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/fb/fbcon.rst b/Documentation/fb/fbcon.rst
index 57f66de..212f700 100644
--- a/Documentation/fb/fbcon.rst
+++ b/Documentation/fb/fbcon.rst
@@ -207,9 +207,9 @@
 Echo a value to the bind file that represents the framebuffer console
 driver. So assuming vtcon1 represents fbcon, then::
 
-  echo 1 > sys/class/vtconsole/vtcon1/bind - attach framebuffer console to
+  echo 1 > /sys/class/vtconsole/vtcon1/bind - attach framebuffer console to
 					     console layer
-  echo 0 > sys/class/vtconsole/vtcon1/bind - detach framebuffer console from
+  echo 0 > /sys/class/vtconsole/vtcon1/bind - detach framebuffer console from
 					     console layer
 
 If fbcon is detached from the console layer, your boot console driver (which is