Update examples.md

[WickyNilliams]

Changes

adds example of using getter for dynamic header with openapi-fetch

How to Review

eyeball code, make sure it looks ok

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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[WickyNilliams]

i just stumbled on this approach when adding such functionality to my own codebase. thought it might be useful in the docs as it feels simpler than the existing examples. seems to work just fine in my testing

[drwpow]

Code looks great! Whoa this is much smarter than some of the other examples! Now I’m tempted to delete the other ones in favor of this one 😄

[WickyNilliams]

Might be worth keeping them, but perhaps reorder so this is presented first :)