feat: Updated and added examples (logs and metrics)

[Jayclifford345]

Description

Small PR to update some of the examples we have within the docs folder.

1. Fixed logs example (collector config errored out due to a bad configuration parameter. The debug component only supports: (detailed|normal|basic)
2. Added example of adding custom attributes to an event in docs/examples/logs/example.py
3. Added example for using PeriodicExportingMetricReader to explicitly collect metrics synchronously. This is to provide an example of the workaround for feat: Synchronous Metrics Reader and Exporter #4549

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Run linting
• Run examples

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[Jayclifford345]

Hi @emdneto,
Apologies for the spelling errors there, I have updated them and run

tox -e spellcheck 

So should have caught all now. The CHANGELOG test failed, so I added it to the PR to the unreleased section, but thought it was such a minor alteration that it wouldn't be needed ,so happy to remove if you like

[emdneto]

Thanks. one more change. I think we don't need changelog, but you've already added so it's up to you. If you want, I can add the label to skip it

[Jayclifford345]

doh! thanks for the catch once again @emdneto :). Thats your change committed.
Now that its there happy to leave it in the changelog since it fixes an example that is breaking without the change :)

[Jayclifford345]

Happy to work on more examples / docs in the future so if you have any in the backlog after this just let me know :)