Fix spelling for updateMetadata

[zachthedev]

udpateMetadata -> updateMetadata
update was misspelled

[gemini-code-assist]

Summary of Changes

Hello @zachthedev, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a simple but pervasive typo in the name of the function and method responsible for updating PDF metadata. The change corrects the spelling from udpateMetadata to updateMetadata wherever it appears in the code and documentation, ensuring consistency and correctness. A minor code style cleanup is also included.

Highlights

• Typo Fix: Corrected the spelling of the updateMetadata function/method name from udpateMetadata in PDFApp.js.
• Documentation Update: Updated README.md to reflect the corrected updateMetadata name in the table of contents, anchor links, headings, and code examples.
• Code Cleanup: Removed a trailing newline character at the end of the PDFApp.js file.

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[gemini-code-assist]

Code Review

This pull request primarily addresses a typo in the updateMetadata function name and its usages, consistently fixing 'udpate' to 'update' across the JavaScript code and the README documentation. These changes are beneficial for code clarity and correctness.

I've included a couple of minor suggestions:

• Correcting a typo in a JSDoc comment to improve documentation accuracy.
• Recommending the addition of a newline at the end of PDFApp.js to align with common best practices.