Copyedits for style, security-jwt-build.adoc

[rolfedh]

This PR includes copy edits to enhance clarity, improve consistency, and align the content with style guidelines for a better reader experience.

[quarkus-bot]

Thanks for your pull request!

Your pull request does not follow our editorial rules. Could you have a look?

• title should preferably start with an uppercase character (if it makes sense!)

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[github-actions]

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[rolfedh]

Hi, @sberyozkin. Please review and comment on this revision. Thank you.

[sberyozkin]

Sorry @rolfedh, I don't mean to be too pedantic, these are last proposed updates, it is just saying a algorithm for the key does not read well, the key is just a blob, and it can be used for different purposes...

[rolfedh]

Sorry @rolfedh, I don't mean to be...

Not at all, @sberyozkin! Refining content is an iterative process and I appreciate all your contributions. Please let me know if you spot anything else we can improve.

[sberyozkin]

Thanks very much @rolfedh, good to see this text being so nicely polished, thanks for that, my suggestions were very minor ones...

[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.