kbuild: fix a couple of typos in Documentation

Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Michal Marek <mmarek@suse.cz>

Documentation/kbuild/kbuild.txt

@@ -65,7 +65,7 @@ CROSS_COMPILE
 Specify an optional fixed part of the binutils filename.
 CROSS_COMPILE can be a part of the filename or the full path.
 
-CROSS_COMPILE is also used for ccache is some setups.
+CROSS_COMPILE is also used for ccache in some setups.
 
 CF
 --------------------------------------------------

Documentation/kbuild/makefiles.txt

@@ -320,7 +320,7 @@ more details, with real examples.
     subdir-ccflags-y, subdir-asflags-y
 	The two flags listed above are similar to ccflags-y and as-falgs-y.
 	The difference is that the subdir- variants has effect for the kbuild
-	file where tey are present and all subdirectories.
+	file where they are present and all subdirectories.
 	Options specified using subdir-* are added to the commandline before
 	the options specified using the non-subdir variants.