* chore(docs): Adding samples for GCE instance creation

Providing samples for the following docs page:
https://cloud.google.com/compute/docs/instances/create-start-instance

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Co-authored-by: Maciej Strzelczyk <strzelczyk@google.com>

autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore(docs): Securing tests against leaks.
* chore(docs): Updating some docstrings.

This is the first ESF (non-legacy) compute API in this repository. This change also depends on updated converter, which sorts all elements of the generated proto file alphabetically (in each section separately: messages, services, methods within services etc).

Applying suggested changes.

Closes #133

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

🤖 I have created a release \*beep\* \*boop\*
---
## [0.7.0](https://www.github.com/googleapis/python-compute/compare/v0.6.0...v0.7.0) (2021-11-09)


### Features

* Integrate latest compute API definitions ([#143](https://www.github.com/googleapis/python-compute/issues/143)) ([878f8fc](https://www.github.com/googleapis/python-compute/commit/878f8fc1508bca794e6b6e633111593aa4aaf265))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).