message: Don't describe the package layout twice.
diff: @@ -178,7 +178,7 @@ manifest is located.
  [Source Replacement]: ../reference/source-replacement.md
  [cargo-unstable]: ../reference/unstable.md
  [config option]: ../reference/config.md
  -[directory layout]: ../reference/manifest.md#the-project-layout
  +[directory layout]: ../guide/project-layout.md
  [edition guide]: ../../edition-guide/index.html
  [edition-field]: ../reference/manifest.md#the-edition-field
  [environment variable]: ../reference/environment-variables.md
  