doc: Add troubleshooting section

[gmuloc]

Description

Add troubleshooting section to doc

Fixes request from Field

Checklist:

• @mtache we need to fix the timeout doc - it says 30 in CLI, 10 in doc and from what I can see it is actually 5 in httpx: https://github.com/encode/httpx/blob/master/httpx/_config.py#L370

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)

[mtache]

The ANTA code does not set any default timeout but in one place: the ANTA CLI. This was done to avoid to maintain different default timeout values in the code.
The AntaDevice class is instantiated with timeout=None by default. Which will disable timeout in httpx, not using the 5 sec default: https://www.python-httpx.org/advanced/timeouts/.

The default timeout value when using ANTA CLI is 30 sec. The 10 sec in docstring is outdated (default value in AntaDevice constructor has changed from 10sec to None).