Fix: misleading example in etagFn documentation

[Ashwani1405]

This PR fixes a misleading etagFn example in the documentation.

The previous example referenced fileContent, which is not available in the function signature and would result in a ReferenceError.

Updated the example to use file metadata (stat.size and stat.mtimeMs), which are actually available.

Also clarified that etagFn only receives fs.Stats and not file content.

Fixes #77

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[VikramAditya33]

The example looks good to me, I've left a comment, take a look at it because I believe it kinda makes sense to me otherwise open for your view as well

[VikramAditya33]

Also CI prettier tests are failing, please take a look at those too

[VikramAditya33]

LGTM, Thank you, could you squash your commits into one?

[Ashwani1405]

Squashed commits into one as requested. Thanks!

[VikramAditya33]

Please link the issue in the PR description properly.

[VikramAditya33]

LGTM, Thank you