t1512: match the "other" object names

The test creates 16 objects that share the same prefix, and two other
objects that do not.  Tweak the test so that the other two share the
same prefix that is different from the one that is shared by the 16.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1512-rev-parse-disambiguation.sh

@@ -98,7 +98,7 @@ test_expect_success 'disambiguate commit-ish' '
 '
 
 test_expect_success 'disambiguate commit' '
-	commit=$(echo "j9xqh" | git commit-tree 0000000000cdc -p 000000000) &&
+	commit=$(echo "hoaxj" | git commit-tree 0000000000cdc -p 000000000) &&
 	test $(git rev-parse $commit^) = $(git rev-parse 0000000000e4f)
 '
 
@@ -254,8 +254,8 @@ test_expect_success 'ambiguous commit-ish' '
 
 test_expect_success 'rev-parse --disambiguate' '
 	# The test creates 16 objects that share the prefix and two
-	# commits created by commit-tree in earlier tests do not share
-	# the prefix.
+	# commits created by commit-tree in earlier tests share a
+	# different prefix.
 	git rev-parse --disambiguate=000000000 >actual &&
 	test $(wc -l <actual) = 16 &&
 	test "$(sed -e "s/^\(.........\).*/\1/" actual | sort -u)" = 000000000