notes: fix a typo

pratically -> practically

Signed-off-by: Abdur Rehman <arehmanq199@gmail.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
diff --git a/notes.txt b/notes.txt
index ba434a3..7a755f5 100644
--- a/notes.txt
+++ b/notes.txt
@@ -61,7 +61,7 @@
 
 - "window managers"
 	The X Window Managers correspond to different wl_shell
-	implementations, not different shells, since they pratically
+	implementations, not different shells, since they practically
 	all deal with a desktop environment. You also want all desktop
 	applications to work with all window managers, so you need to
 	implement wl_shell anyway.