Address review feedback

src/lib.rs

@@ -503,14 +503,19 @@ pub struct Target {
     /// Name as given in the `Cargo.toml` or generated from the file name
     pub name: String,
     /// Kind of target.
+    ///
     /// The possible values are `example`, `test`, `bench`, `custom-build` and
     /// [Cargo crate types](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-crate-type-field):
-    /// `bin`, `lib`, `rlib`, `dylib`, `cdylib`, `staticlib`, `proc-macro`
+    /// `bin`, `lib`, `rlib`, `dylib`, `cdylib`, `staticlib`, `proc-macro`.
+    ///
+    /// Other possible values may be added in the future.
     pub kind: Vec<String>,
     /// Similar to `kind`, but only reports the
     /// [Cargo crate types](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-crate-type-field):
     /// `bin`, `lib`, `rlib`, `dylib`, `cdylib`, `staticlib`, `proc-macro`.
     /// Everything that's not a proc macro or a library of some kind is reported as "bin".
+    ///
+    /// Other possible values may be added in the future.
     #[serde(default)]
     #[cfg_attr(feature = "builder", builder(default))]
     pub crate_types: Vec<String>,