docs: add Raises and Examples to load_config_and_datastore in config.py (builds on #252)

[Seai5]

Describe your changes

This PR adds Raises and Examples sections to the load_config_and_datastore function in config.py.

• Raises section documents common exceptions (FileNotFoundError, ValueError, InvalidConfigError, etc.)
• Examples section shows practical usage for better beginner understanding

This makes the docstring more complete and user-friendly, complementing #252 (100% docstring coverage PR).

Issue Link

#252
Related: closed #460 (redirected to #252 by @sadamov)

Type of change

☐ 🐛 Bug fix (non-breaking change that fixes an issue)
☑ ✨ New feature (non-breaking change that adds functionality)
☐ 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
☑ 📖 Documentation (Addition or improvements to documentation)

Checklist before requesting a review

☑ My branch is up-to-date with the target branch.
☑ I have performed a self-review of my code
☑ For any new/modified functions/classes I have added docstrings that clearly describe its purpose, expected inputs and returned values
☑ I have placed in-line comments to clarify the intent of any hard-to-understand passages of my code
☐ I have updated the README to cover introduced code changes
☐ I have added tests that prove my fix is effective or that my feature works
☑ I have given the PR a name that clearly describes the change, written in imperative form (context).
☐ I have requested a reviewer and an assignee (assignee is responsible for merging). This applies only if you have write access to the repo, otherwise feel free to tag a maintainer to add a reviewer and assignee.

Checklist for reviewers

• the code is readable
• the code is well tested
• the code is documented (including return types and parameters)
• the code is easy to maintain

Author checklist after completed review

☐ I have added a line to the CHANGELOG describing this change, in a section reflecting type of change (add section where missing):
☐ added
☐ changed
☐ fixes
☐ maintenance

[kshirajahere]

Hey @Seai5 Please follow the PR template

[Seai5]

Hi @kshirajahere,

Thank you for the reminder!

I just updated the PR description to follow the template.

Let me know if anything is still missing or needs adjustment.

Best regards,
hrithik

[sadamov]

@Seai5 since this change is small I propose to add it as a review comment in #252 directly instead of opening a new PR here (which is also pointing to main)

[Seai5]

Hi @sadamov,

Thank you for the review and guidance!

I understand — I'll add the Raises + Examples improvements as a review comment directly on #252 instead.

Appreciate the feedback

Best,
hrithik