Fixed the target type for the sample target in the Package file as an executable target.

Package.swift

@@ -23,15 +23,7 @@ let package = Package(
         .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.1.0"),
     ],
     targets: [
-        .target(
-            name: DocCMiddleware.target,
-            dependencies: [
-                .product(name: "Hummingbird", package: "hummingbird"),
-            ],
-            path: "Sources/DocCMiddleware",
-            swiftSettings: [.enableExperimentalFeature("StrictConcurrency=complete")]
-        ),
-        .target(
+        .executableTarget(
             name: DocCMiddleware.sample,
             dependencies: [
                 .byName(name: DocCMiddleware.target),
@@ -45,6 +37,14 @@ let package = Package(
                 .unsafeFlags(["-cross-module-optimization"], .when(configuration: .release)),
             ]
         ),
+        .target(
+            name: DocCMiddleware.target,
+            dependencies: [
+                .product(name: "Hummingbird", package: "hummingbird"),
+            ],
+            path: "Sources/DocCMiddleware",
+            swiftSettings: [.enableExperimentalFeature("StrictConcurrency=complete")]
+        ),
         .testTarget(
             name: DocCMiddleware.test,
             dependencies: [