Make maintainer-clean delete generated files, as per standards

These are generated files that were once kept in the repository.
When they were removed from the repository, as a half-way measure
they were only deleted by "extraclean", but this was never
necessary and was not a proper use of that rule.
* admin/charsets/Makefile.in (gen-clean): New phony target.
(maintainer-clean): Delete generated files.
* admin/grammars/Makefile.in (gen-clean): New phony target.
(maintainer-clean): Delete generated files.
* admin/unidata/Makefile.in (gen-clean): New phony target.
(maintainer-clean): Delete generated files.
* leim/Makefile.in (gen-clean): New phony target.
(maintainer-clean): Delete generated files.
* GNUmakefile: Doc fix.

1 files changed, 2 insertions, 2 deletions

diff --git a/GNUmakefile b/GNUmakefile
index 0e01b808a0f..5155487de28 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -50,8 +50,8 @@ help:
 	@echo "make distclean        -- delete all build and configuration files,"
 	@echo "                         leave only files included in source distribution"
 	@echo "make maintainer-clean -- delete almost everything that can be regenerated"
-	@echo "make extraclean       -- like maintainer-clean, and also delete all generated"
-	@echo "                         files, backup files and autosave files"
+	@echo "make extraclean       -- like maintainer-clean, and also delete"
+	@echo "                         backup and autosave files"
 	@echo "make bootstrap        -- delete all compiled files to force a new bootstrap"
 	@echo "                         from a clean slate, then build in the normal way"
 	@echo "make uninstall        -- remove files installed by 'make install'"