should make clear the credentials store path

[HomyeeKing]

Merry Christmas :)

From here #7295 since 1.39, specifically this comment. However, the transition period was not what I expected or not finished. Feel like Cargo should by default write to credentials.toml.

I'd suggest transferring this to rust-lang/cargo. Cargo then can do such enhancements:

• File a patch writing to credentials.toml if credentials doesn't exist.
• Document the fallback behavior properly.
• rust-lang/crates.io could cross-link to cargo doc to avoid doc duplicate.

Originally posted by @weihanglo in rust-lang/crates.io#5730 (comment)

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I found the token was stored at ~/.cargo/credentials (create at yesterday by cargo login ) instead of ~/.cargo/credentials.toml, I thought it was a mistake of crate.io docs, but turn out that it's the mismatch logic of cargo.

I have same opinion with @weihanglo 👆