message: Point Source Replacement to the Overriding Dependencies section
  This would've saved me a minute. This mirrors a similarly helpful caveat in [the [patch] section](https://doc.rust-lang.org/cargo/reference/manifest.html#the-patch-section).
diff: ## Source Replacement
  +This document is about replacing the crate index. You can read about overriding
  +dependencies in the [overriding dependencies][overriding] section of this
  +documentation.
  +
  Cargo supports the ability to **replace one source with another** to express
  strategies along the lines of mirrors or vendoring dependencies. Configuration
  is currently done through the [`.cargo/config` configuration][config] mechanism,
  @@ -56,6 +60,7 @@ dependencies through the usage of [the `[replace]` key][replace-section], and
  private registry support is planned for a future version of Cargo.
  [replace-section]: reference/manifest.html#the-replace-section
  +[overriding]: reference/specifying-dependencies.html#overriding-dependencies
  ### Configuration
  