[Portal Documentation] Fix: Typo Fix

[aramxc]

Really simple typo fix in the getting-started docs

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PR-Codex overview

This PR focuses on minor textual corrections in the page.mdx file related to the getting started documentation for the thirdweb SDK.

Detailed summary

• Corrected the phrase "A client is all your need" to "A client is all you need."
• Added a newline at the end of the file to ensure proper formatting.

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