message: Recover non-virtual default-members doc
  First changed in which failed
  to update the book and was replaced in
diff: @@ -536,21 +536,24 @@ crate will be treated as a normal package, as well as a workspace. If the
  `package` table is not present in a workspace manifest, it is called a *virtual
  manifest*.
  -When working with *virtual manifests*, package-related cargo commands, like
  -`cargo build`, default to the set of packages specified by the `default-members`
  -configuration:
  +#### Package selection
  +
  +In a workspace, package-related cargo commands like `cargo build` apply to
  +packages selected by `-p` / `--package` or `--all` command-line parameters.
  +When neither is specified, the optional `default-members` configuration is used:
  ```toml
  [workspace]
  members = ["path/to/member1", "path/to/member2", "path/to/member3/*"]
  -
  -# The members that commands like `cargo build` apply to by deault.
  -# This must expand to a subset of `members`.
  -# Optional key, defaults to the same as `members`
  -# (as if `--all` were used on the command line).
  -default-members = ["path/to/member2", "path/to/member3/*"]
  +default-members = ["path/to/member2", "path/to/member3/foo"]
  ```
  +When specified, `default-members` must expand to a subset of `members`.
  +
  +When `default-members` is not specified, the default is the root manifest
  +if it is a package, or every member manifest (as if `--all` were specified
  +on the command-line) for virtual workspaces.
  +
  #TODO: move this to a more appropriate place
  ### The project layout
  