[DOC] Upgrade kubectl and helm versions

Kubectl/Helm version in installation description got
updated to those required by current release.

Change-Id: I0526577321a46603f5cf65643cbed5d01b8d59df
Issue-ID: OOM-1
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
1 file changed