Correcting mistakes in the README.md

[GAJaloyan]

Correcting the two mistakes in the README.md (issue #40793)

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @arielb1 (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[GAJaloyan]

I corrected another mistake in an example: the name of the function defined does not match the called function in the main function.

[arielb1]

We are going to tear this down anyway, but
@bors r+ rollup

[bors]

📌 Commit c80868e has been approved by arielb1