kbuild: fix some minor typoes

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index 2c64710..6f89fbb 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -37,7 +37,7 @@
 
 subdir-ymn	:= $(addprefix $(obj)/,$(subdir-ymn))
 
-# build a list of files to remove, usually releative to the current
+# build a list of files to remove, usually relative to the current
 # directory
 
 __clean-files	:= $(extra-y) $(always)                  \