message: docs(ref): Have workspace docs link out to patch/replace docs
  The workspace behavior doesn't seem to be documented at all, so a blurb
  was brought in that is like the profile blurb.  The workspace docs then
  link out to it so users can be aware of this special workspace behavior.
diff: @@ -291,6 +291,10 @@ also be patched with versions of crates that already exist. If a source is
  patched with a crate version that already exists in the source, then the
  source's original crate is replaced.
  +Cargo only looks at the patch settings in the `Cargo.toml` manifest at the
  +root of the workspace. Patch settings defined in dependencies will be
  +ignored.
  +
  ### The `[replace]` section
  > **Note**: `[replace]` is deprecated. You should use the
  @@ -313,6 +317,10 @@ dependencies, except that you can't specify features. Note that when a crate
  is overridden the copy it's overridden with must have both the same name and
  version, but it can come from a different source (e.g., git or a local path).
  +Cargo only looks at the replace settings in the `Cargo.toml` manifest at the
  +root of the workspace. Replace settings defined in dependencies will be
  +ignored.
  +
  ### `paths` overrides
  Sometimes you're only temporarily working on a crate and you don't want to have
  