message: Update src/doc/src/reference/manifest.md
  Add a link to the mdbook generated link
diff: @@ -427,7 +427,7 @@ external tools may wish to use them in a consistent fashion, such as referring
  to the data in `workspace.metadata` if data is missing from `package.metadata`,
  if that makes sense for the tool in question.
  -[workspace-metadata](workspaces.md#the-workspace-metadata-table)
  +[workspace-metadata]: workspaces.md#the-workspacemetadata-table
  #### The `default-run` field
  