make corrections in api-ref documentation

[Amrith Kumar]

These are the comments from Mariam John in https://review.openstack.org/#/c/356631/3 which I want to make sure we record, and correct.

api-ref/source/database-instance-actions.inc
Line 20:

Looks like throughout it's making references to MySQL specifically. I think we will have to generalize this.
api-ref/source/database-instances.inc
Line 10:

small typo - whether root is enabled
api-ref/source/databases.inc
Line 66:

It is showing 'name' as optional instead of required as per definition
api-ref/source/user-management.inc
Line 215:

The description for database name mentions that you have to specify one or more database names whereas it is not a required field.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/357792

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/357792
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=d797074053811f53b4148dc5ba0545e5c7b0354e
Submitter: Jenkins
Branch: master

commit d797074053811f53b4148dc5ba0545e5c7b0354e
Author: Amrith Kumar <email address hidden>
Date: Fri Aug 19 07:32:06 2016 -0400

    Update api-ref documentation

    This change updates the api-ref documentation with some issues
    identified in an earlier review.

    Change-Id: Ic769a1ae376e8569f5a13af8feada88f4cf0ac32
    Closes-Bug: 1614923
    Related: I3315261aa18729fa7a6aa79d4a1d6c24de1e2c6b