kbuild, mtd, net: a few comment typo fixes and rewording

Signed-off-by: Gilles Espinasse <g.esp@free.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 86e3cd0..5d145bb 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1325,7 +1325,8 @@
 	If this variable is specified, will cause modules to be stripped
 	after they are installed.  If INSTALL_MOD_STRIP is '1', then the
 	default option --strip-debug will be used.  Otherwise,
-	INSTALL_MOD_STRIP will used as the option(s) to the strip command.
+	INSTALL_MOD_STRIP value will be used as the option(s) to the strip
+	command.
 
 
 === 9 Makefile language