Some of VNF packages API documentation is incorrect

[Hiroo Kitamura]

In the following VNF packages API document, there are some errors that need to be corrected.
https://docs.openstack.org/api-ref/nfv-orchestration/v1/index.html

* Error1: URI path
Upload VNF Package from uri
 - Incorrect:/vnf_packages/{vnf_package_id}/package_content/upload_from_uri
 - Correct:/vnfpkgm/v1/vnf_packages/{vnf_package_id}/package_content/upload_from_uri

* Error2: Request Parameters
Upload VNF Package from uri
 - userName
 - password
These parameters are Optional.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/731033

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/731034

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/731033
Committed: https://git.openstack.org/cgit/openstack/tacker/commit/?id=d0ae0ef29fd085fa380bd8c9f50537383c5e53e2
Submitter: Zuul
Branch: master

commit d0ae0ef29fd085fa380bd8c9f50537383c5e53e2
Author: Hiroo Kitamura <email address hidden>
Date: Tue May 26 11:18:45 2020 +0900

    Modify VNF packages API documentation

    In this patch, modify VNF packages API documentation.
    I modify the following 2 errors.

    * Modify error of URI path
    Upload VNF Package from uri
     - Incorrect:/vnf_packages/{vnf_package_id}/package_content/upload_from_uri
     - Correct:/vnfpkgm/v1/vnf_packages/{vnf_package_id}/package_content/upload_from_uri

    * Modify error of request parameters
    Upload VNF Package from uri
     - userName
     - password
    These parameters are Optional but the notations are missing.
    The other parameters are similarly modified.

    Change-Id: I30ad2d3f3046993d18d1be410b1a9f007e583eff
    Closes-Bug: #1880110

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/731034
Committed: https://git.openstack.org/cgit/openstack/tacker/commit/?id=fb45f2785e044e34d4bced518cdeb0db4153d333
Submitter: Zuul
Branch: master

commit fb45f2785e044e34d4bced518cdeb0db4153d333
Author: Hiroo Kitamura <email address hidden>
Date: Wed May 27 11:31:28 2020 +0900

    Improve VNF packages API documentation

    In this patch, improve VNF packages API documentation.

    * Modify the reference yaml of inc file
    Modify the reference yaml of 'vnf_packages.inc' from 'parameter.yaml' to 'parameters_vnf_packages.yaml'.
    This is an improvement of the document structure.
    (Like 'parameters_vnflcm.yaml'.)

    * Modify key name of parameter to snake case
    Modify key name of parameter included in 'parameters_vnf_packages.yaml' to snake_case.
    Currently, snake_case and camelCase are mixed.

    Change-Id: Ia90204bee90d0103bec6a23ccbdd70b33a6e1e70
    Related-Bug: #1880110