Identity v2.0/tenants example shows v2.0/tokens/tenants

The call to the identity api v2.0/tenants is shown in the example using
v2.0/tokens/tenants and should be as the title v2.0/tenants

Closes-bug: #1334285
Change-Id: Ie8db3f577fc98decdeb2be36929c03f61f09abd8
Merge "Identity v2.0/tenants example shows v2.0/tokens/tenants"