docproc: style & typo cleanups

- fix typos/spellos in docproc.c and Makefile
- add a little whitespace {while, switch} (coding style)
- use NULL instead of 0 for pointer testing

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/basic/Makefile b/scripts/basic/Makefile
index 2f60070..4c324a1 100644
--- a/scripts/basic/Makefile
+++ b/scripts/basic/Makefile
@@ -1,13 +1,13 @@
 ###
-# Makefile.basic list the most basic programs used during the build process.
-# The programs listed herein is what is needed to do the basic stuff,
-# such as fix dependency file.
+# Makefile.basic lists the most basic programs used during the build process.
+# The programs listed herein are what are needed to do the basic stuff,
+# such as fix file dependencies.
 # This initial step is needed to avoid files to be recompiled
 # when kernel configuration changes (which is what happens when
 # .config is included by main Makefile.
 # ---------------------------------------------------------------------------
 # fixdep: 	 Used to generate dependency information during build process
-# docproc:	 Used in Documentation/docbook
+# docproc:	 Used in Documentation/DocBook
 
 hostprogs-y	:= fixdep docproc
 always		:= $(hostprogs-y)