Can't find "use-jemalloc" in config.toml.

[kenta7777]

how-to-build-and-run.md tells us to open up to config.toml file and change the following settings.
use-jemalloc = false
However, the statement cannot be found in the file.

[ehuss]

This was changed just a day ago to jemalloc = false in rust-lang/rust#55238.

[kenta7777]

@ehuss Thank you for your comment. Then, should I send a PR for this revision?

[mark-i-m]

That would be great!

[kenta7777]

@mark-i-m I'll send a PR.

[kenta7777]

Thanks!