Add convenience targets that build all archive types for single formatting
versions.
diff --git a/Doc/Makefile b/Doc/Makefile
index b8cc712..d9cd394 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -387,6 +387,12 @@
 
 bzips:		bzippdf bzipps bziphtml
 
+disthtml:	tarhtml bziphtml ziphtml
+distinfo:	tarinfo bzipinfo
+distps:		tarps bzipps zipps
+distpdf:	tarpdf bzippdf zippdf
+distlatex:	tarlatex bziplatex ziplatex
+
 distfiles:	tarballs zips bzips
 	$(TOOLSDIR)/mksourcepkg --all $(RELEASE)