[MINOR] Addressed Docs dependency security vulnerability followup
[MINOR] Addressed Docs dependency security vulnerability followup

Followup to 26428c56f20ba5ea608038ed8c2e11d8f04665d4

Author: Alex Bozarth <ajbozart@us.ibm.com>

Closes #82 from ajbozarth/gem.

meisam/incubator-livy,meisam/incubator-livy,ajbozarth/incubator-livy,meisam/incubator-livy,meisam/incubator-livy,ajbozarth/incubator-livy,ajbozarth/incubator-livy,meisam/incubator-livy,ajbozarth/incubator-livy,ajbozarth/incubator-livy,meisam/incubator-livy,ajbozarth/incubator-livy