kbuild: fix a few typos in top-level Makefile

Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Acked-by: Dmitry Gryazin <gdu@mns.spb.ru>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/Makefile b/Makefile
index e5ad5fd..3e95d45 100644
--- a/Makefile
+++ b/Makefile
@@ -567,7 +567,7 @@
 # disable pointer signed / unsigned warnings in gcc 4.0
 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 
-# disable invalid "can't wrap" optimzations for signed / pointers
+# disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS	+= $(call cc-option,-fwrapv)
 
 # revert to pre-gcc-4.4 behaviour of .eh_frame
@@ -1587,5 +1587,5 @@
 FORCE:
 
 # Declare the contents of the .PHONY variable as phony.  We keep that
-# information in a variable se we can use it in if_changed and friends.
+# information in a variable so we can use it in if_changed and friends.
 .PHONY: $(PHONY)