Change Details

D13145 bumped the nightly version, update the instructions in CONTRIBUTING.md accordingly.

D13145 bumped the nightly version, update the instructions in CONTRIBUTING.md accordingly. Note: To uninstall the old nightly version, run `rustup toolchain uninstall nightly-2022-06-29`

D13145 bumped the nightly version, update the instructions in CONTRIBUTING.md accordingly. Note: To uninstall the old nightly version, run `rustup toolchain uninstall nightly-2022-06-29`