Meta/Make, Meta/dodoc: enable BOLD_LITERAL

While at it, retire use of old environment variables ASCIIDOC8 and
ASCIIDOC_NO_ROFF, which were retired at 79c461d5 (docs: default to
more modern toolset, 2010-11-19).

Make

@@ -231,8 +231,7 @@ then
 fi
 
 set	MAN_BASE_URL='"http://www.kernel.org/pub/software/scm/git/docs/"' \
-	ASCIIDOC_NO_ROFF=YesPlease \
-	ASCIIDOC8=YesPlease \
+	MAN_BOLD_LITERAL=YesPlease \
 	BLK_SHA1=YesPlease \
 	GNU_ROFF=YesPlease \
 	"$@"

dodoc.sh

@@ -62,11 +62,10 @@ done
 # The below used to contain this instead...
 # MAN_BASE_URL="http://www.kernel.org/pub/software/scm/git/docs/"
 dd='
-	ASCIIDOC_NO_ROFF=YesPlease
-	ASCIIDOC8=YesPlease
 	MAN_BASE_URL="git-htmldocs/"
 	BLK_SHA1=YesPlease
 	GNU_ROFF=YesPlease
+	MAN_BOLD_LITERAL=YesPlease
 '
 
 if test -z "$DOC_FROM_SCRATCH"