Clarify error message in benchmark plugin

Bug: 287505116
Test: just string change
Change-Id: I10a0963d6b2e225362afa2c6f168939d4180586b
diff --git a/benchmark/gradle-plugin/src/main/kotlin/androidx/benchmark/gradle/BenchmarkPlugin.kt b/benchmark/gradle-plugin/src/main/kotlin/androidx/benchmark/gradle/BenchmarkPlugin.kt
index 6b33bd9..5f656dc 100644
--- a/benchmark/gradle-plugin/src/main/kotlin/androidx/benchmark/gradle/BenchmarkPlugin.kt
+++ b/benchmark/gradle-plugin/src/main/kotlin/androidx/benchmark/gradle/BenchmarkPlugin.kt
@@ -42,12 +42,12 @@
         // Verify that the configuration from this plugin dependent on AGP was successfully applied.
         project.afterEvaluate {
             if (!foundAndroidPlugin) {
-                throw StopExecutionException(
-                    """A required plugin, com.android.application or com.android.library was not
-                        found. The androidx.benchmark plugin currently only supports android
-                        application or library modules. Ensure that a required plugin is applied
-                        in the project build.gradle file."""
-                        .trimIndent()
+                throw StopExecutionException("""
+                        The androidx.benchmark plugin currently supports only android library
+                        modules. Ensure that `com.android.library` is applied in the project
+                        build.gradle file. Note that to run macrobenchmarks, this plugin is not
+                        required.
+                        """.trimIndent()
                 )
             }
         }