[Documentation] Updated the checkpatch parameters

Newer versions of checkpatch check for the use of camel case in the
code.  Although, dLeyna does not itself use camel case, it uses a lot
of glib structures and functions that do.  Therefore, this warning needs
to be disabled, otherwise you see a lot of spurious errors.

Signed-off-by: Mark Ryan <mark.d.ryan@intel.com>

doc/coding-style.txt

@@ -184,7 +184,7 @@ kernel version:
 
 You can run it on files with these options:
 
-checkpatch.pl --no-tree -f --strict --show-types --ignore NEW_TYPEDEFS
+checkpatch.pl --no-tree -f --strict --show-types --ignore NEW_TYPEDEFS --ignore CAMELCASE
 
 checkpatch.pl exceptions:
 -------------------------