Update sdk-python.md

[haritha91]

Change the endpoint URL to the new format as reflected in the Language Studio.

[prmerger-automator]

@haritha91 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 4b1b18e:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/ai-services/language-service/question-answering/includes/sdk-python.md	✅Succeeded

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[v-regandowner]

@jboback - Would you review the proposed changes?

If the submission is approved for merge, add the #sign-off comment. Thanks

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[v-dirichards]

@jboback - Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!

[github-actions]

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[v-dirichards]

@jboback @nitinme

Can you review this old PR and determine whether it needs to be closed or merged?

@MicrosoftDocs/public-repo-pr-review-team