Fix a typo in doc/confdir.sgml.in

Since changes introduced by e181ab4d
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 2cb6410..36f78da 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -200,7 +200,7 @@
 	$(RM) devel-man/manpage.* &&		\
 	rmdir devel-man || rm $@ || :
 confdir.sgml: $(srcdir)/confdir.sgml.in
-	$(AM_V_GEN) sed -e 's,@CONFDIR\@,${CONFDIR},' $(srcdir)/$@.in | awk '{if (NR > 1) printf("\n"); printf("%s", $$0);}' > $@
+	$(AM_V_GEN) sed -e 's,@BASECONFIGDIR\@,${BASECONFIGDIR},' $(srcdir)/$@.in | awk '{if (NR > 1) printf("\n"); printf("%s", $$0);}' > $@
 ##
 $(DOC_FUNCS_SGML): $(DOC_FUNCS_FNCS) edit-sgml$(EXEEXT) $(srcdir)/func.sgml
 $(TXT_FILES): $(DOCS_DEPS)
diff --git a/doc/confdir.sgml.in b/doc/confdir.sgml.in
index cfcaa9f..fd4d737 100644
--- a/doc/confdir.sgml.in
+++ b/doc/confdir.sgml.in
@@ -22,5 +22,5 @@
    PERFORMANCE OF THIS SOFTWARE.
 -->
 <!-- this is filled in at make time -->
-<!--@CONFDIR@-->
+<!--@BASECONFIGDIR@-->
 /etc/fonts