Clarify Locust web interface usage in load testing guide

[Adit-Mishra1]

Summary

This PR adds a brief clarification explaining the purpose of the Locust web interface when running the load test.

Motivation

Helps first-time users better understand how to configure and monitor the load test after starting Locust.

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Learn Build status updates of commit 7dadeb8:

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File	Status	Preview URL	Details
articles/python/get-started-app-chat-app-load-test-locust.md	✅Succeeded

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[v-regandowner]

@ms-johnalex

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#label:"aq-pr-triaged"
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Pull request overview

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There are now two consecutive blank lines after the table (lines 68-69). According to standard Markdown practices and the Microsoft Writing Style Guide, only one blank line is needed between content blocks. Remove the extra blank line.

Suggested change