Assertion example and test runner link in portuguese language added.

[beinghumantester]

User description

Added a reference to the existing assertion code (assertEquals("Web form", title)) and test runner link in usingselenium.pt-br.md to improve documentation clarity.

Description

• Linked the assertion line in the Kotlin example section.
• Added Test Runner Reference in the Kotlin section.
• Ensured consistency in the documentation.

Motivation and Context

• Improves visibility of assertion usage in Selenium’s Kotlin examples.
• Enhances documentation clarity and consistency.

Types of changes

• Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• Code example added (and I also added the example to all translated languages)
• Improved translation
• Added new translation (and I also added a notice to each document missing translation)

Checklist

• I have read the contributing document.
• I have used hugo to render the site/docs locally, and I am sure it works.

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