Improve comments + fix test

Author: alextwoods

core/aws-core/src/main/java/software/amazon/awssdk/awscore/endpoints/AwsEndpointAttribute.java

@@ -34,7 +34,7 @@ public final class AwsEndpointAttribute {
         EndpointAttributeKey.forList("AuthSchemes");
 
     /**
-     * Business Metric values for the endpoint.
+     * Business Metric values to be added to the user-agent for the endpoint.
      */
     public static final EndpointAttributeKey<List<String>> METRIC_VALUES =
         EndpointAttributeKey.forList("MetricValues");

test/codegen-generated-classes-test/src/test/java/software/amazon/awssdk/services/EndpointMetricValuesTest.java

@@ -17,7 +17,6 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
@@ -83,7 +82,7 @@ void endpointMetricValuesAreAddedToUserAgent() {
 
         String userAgent = assertAndGetUserAgentString();
         Matcher businessMetricMatcher = Pattern.compile("m/([^\\s]+)").matcher(userAgent);
-        assertTrue(businessMetricMatcher.matches());
+        assertTrue(businessMetricMatcher.find());
         assertNotNull(businessMetricMatcher.group(1));
         Set<String> metrics = new HashSet<>(Arrays.asList((businessMetricMatcher.group(1).split(","))));
         assertTrue(metrics.containsAll(Arrays.asList("O", "K")));