docs: use named logger with the AzureMonitorLogExporter instead of root logger

[johschmidt42]

Description

The example for the AzureMonitorLogExporter: Export Hello World Log fails if the LoggingHandler is added to the root logger because of recursive behaviour. Therefore it is recommended to add the LoggingHandler to a named logger instead or silence the azure-core sdk as discussed in #34787.

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[github-actions]

Thank you for your contribution @johschmidt42! We will review the pull request and get back to you soon.

[johschmidt42]

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[lzchen]

@johschmidt42

Thanks for the contribution!