hg: jdk/sandbox: 8221357: Update test documentation by deleting "cd test && make"

[chris.hegarty at oracle.com]

Changeset: 0cf2c87ce79a
Author:    dholmes
Date:      2019-03-25 17:29 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/0cf2c87ce79a

8221357: Update test documentation by deleting "cd test && make"
Reviewed-by: dholmes, tbell, erikj
Contributed-by: Jing Tian <jingtian at loongson.cn>

! doc/testing.html
! doc/testing.md