message: doc (book)[13/14]: "Cargo Guide"/"Cargo Home": link terms to glossary
  The following term(s) are linked to their Glossary entries:
  - crate
  - package
  - registry
diff: ## Cargo Home
  The "Cargo home" functions as a download and source cache.
  -When building a crate, Cargo stores downloaded build dependencies in the Cargo home.
  +When building a [crate][def-crate], Cargo stores downloaded build dependencies in the Cargo home.
  You can alter the location of the Cargo home by setting the `CARGO_HOME` [environmental variable][env].
  The [home](https://crates.io/crates/home) crate provides an API for getting this location if you need this information inside your Rust crate.
  By default, the Cargo home is located in `$HOME/.cargo/`.
  @@ -16,10 +16,10 @@ The Cargo home consists of following components:
  Cargo's global configuration file, see the [config entry in the reference][config].
  * `credentials.toml`
  - Private login credentials from [`cargo login`] in order to log in to a registry.
  + Private login credentials from [`cargo login`] in order to log in to a [registry][def-registry].
  * `.crates.toml`
  - This hidden file contains package information of crates installed via [`cargo install`]. Do NOT edit by hand!
  + This hidden file contains [package][def-package] information of crates installed via [`cargo install`]. Do NOT edit by hand!
  ## Directories:
  @@ -83,4 +83,7 @@ Alternatively, the [cargo-cache](https://crates.io/crates/cargo-cache) crate pro
  [`cargo login`]: ../commands/cargo-login.md
  [`cargo vendor`]: ../commands/cargo-vendor.md
  [config]: ../reference/config.md
  +[def-crate]: ../appendix/glossary.md#crate '"crate" (glossary entry)'
  +[def-package]: ../appendix/glossary.md#package '"package" (glossary entry)'
  +[def-registry]: ../appendix/glossary.md#registry '"registry" (glossary entry)'
  [env]: ../reference/environment-variables.md
  