address comment

Author: chungen0126

hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/testing.md

@@ -774,7 +774,7 @@ Tests in `ITestS3AContentEncoding` may need disabling
 
 ### Disabling tests running in performance mode
 
-Some tests running in performance mode turn off the safety checks. They expect breaking posix semantics.
+Some tests running in performance mode turn off the safety checks. They expect operations which break POSIX semantics to succeed.
 For stores with stricter semantics, these test cases must be disabled.
 ```xml
   <property>

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/S3ATestConstants.java

@@ -66,7 +66,7 @@ public interface S3ATestConstants {
   /**
    * A property set to true if tests running in performance mode are enabled: {@value }
    */
-  String KEY_PERFORMANCE_TESTS_ENABLED = TEST_FS_S3A + "perf.enabled";
+  String KEY_PERFORMANCE_TESTS_ENABLED = TEST_FS_S3A + "performance.enabled";
 
   /**
    * A property set to true if V1 tests are enabled: {@value}.