message: doc (book)[08/14]: "Cargo Guide"/"Dependencies": link terms to glossary
  The following term(s) are linked to their Glossary entries:
  - crate
  - package
  - package registry
diff: ## Dependencies
  -[crates.io] is the Rust community's central package registry that serves as a
  -location to discover and download packages. `cargo` is configured to use it by
  -default to find requested packages.
  +[crates.io] is the Rust community's central [*package registry*][def-package-registry]
  +that serves as a location to discover and download
  +[packages][def-package]. `cargo` is configured to use it by default to find
  +requested packages.
  To depend on a library hosted on [crates.io], add it to your `Cargo.toml`.
  @@ -10,9 +11,9 @@ To depend on a library hosted on [crates.io], add it to your `Cargo.toml`.
  ### Adding a dependency
  -If your `Cargo.toml` doesn't already have a `[dependencies]` section, add that,
  -then list the crate name and version that you would like to use. This example
  -adds a dependency of the `time` crate:
  +If your `Cargo.toml` doesn't already have a `[dependencies]` section, add
  +that, then list the [crate][def-crate] name and version that you would like to
  +use. This example adds a dependency of the `time` crate:
  ```toml
  [dependencies]
  @@ -87,3 +88,7 @@ $ cargo run
  Running `target/hello_world`
  Did our date match? true
  ```
  +
  +[def-crate]: ../appendix/glossary.md#crate '"crate" (glossary entry)'
  +[def-package]: ../appendix/glossary.md#package '"package" (glossary entry)'
  +[def-package-registry]: ../appendix/glossary.md#package-registry '"package-registry" (glossary entry)'
  