doc: Update instructions on using native-completions (#15480)

`~/.local/share/bash-completion/completions/cargo` is more sensible, and
[recommended by
rustup](e4f3ad6f89/src/cli/help.rs (L275)).

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@ -1817,10 +1817,10 @@ When in doubt, you can discuss this in [#14520](https://github.com/rust-lang/car
### How to use native-completions feature:
- bash:
Add `source <(CARGO_COMPLETE=bash cargo +nightly)` to your .bashrc.
Add `source <(CARGO_COMPLETE=bash cargo +nightly)` to `$XDG_DATA_HOME/bash-completion/completions/cargo`, or `~/.local/share/bash-completion/completions/cargo` if `XDG_DATA_HOME` is not set.
- zsh:
Add `source <(CARGO_COMPLETE=zsh cargo +nightly)` to your .zshrc.
Add `source <(CARGO_COMPLETE=zsh cargo +nightly)` to your `.zshrc`.
- fish:
Add `source (CARGO_COMPLETE=fish cargo +nightly | psub)` to `$XDG_CONFIG_HOME/fish/completions/cargo.fish`