Use correct "D-Bus" spelling in cheatsheet.md

Change "dbus" to the correct spelling "D-Bus".

Change-Id: Ib74c6838aec54847e1c7ba2cd56be4dbfa484e75
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/cheatsheet.md b/cheatsheet.md
index c90f773..970664a 100644
--- a/cheatsheet.md
+++ b/cheatsheet.md
@@ -63,13 +63,13 @@
 ```
 and running `openbmc-env` again (possibly with `TEMPLATECONF` set).
 
-## Useful dbus CLI tools
+## Useful D-Bus CLI tools
 
 ## `busctl`
 
 http://www.freedesktop.org/software/systemd/man/busctl.html
 
-Great tool to issue dbus commands via cli. That way you don't have to wait for
+Great tool to issue D-Bus commands via cli. That way you don't have to wait for
 the code to hit the path on the system. Great for running commands with QEMU
 too!