Add example for timeout error for troubleshooting
Add example for timeout error for troubleshooting

This commit adds an example which shows an unknown instance name when a
timeout error is raised when specific agent methods are called (e.g.
`get_task` or `get_state`, etc...).

[#161464080](https://www.pivotaltracker.com/story/show/161464080)

Co-authored-by: Sebastian Heid <b3c0fb010e559328a5e2658581c70095793a2c99@sap.com>

cloudfoundry/docs-bosh