message: Fix `default-members` docs: it also applies to non-virtual workspaces.
diff: @@ -519,21 +519,24 @@ 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.
  +
  # The project layout
  If your project is an executable, name the main source file `src/main.rs`. If it
  