Fix typos in comments across layout.rs and lib.rs files

[xosnrdev]

Corrected spelling errors in comments to improve clarity and maintain consistency in terminology. Changes include:

• "initialised" to "initialized"
• "optimisation" to "optimization"
• "realising" to "realizing"

These updates enhance the readability of the code without altering functionality.

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @SparrowLii (or someone else) some time within the next two weeks.

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[lqd]

These are not typos, just british spelling versus american spelling. We don't need to do this.