HADOOP-14092. Typo in hadoop-aws index.md. Contributed by John Zhuge

(cherry picked from commit b1c1f05b1dc997906390d653dfafb4f0d7e193c4)

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

@@ -2250,7 +2250,7 @@ like `ITestS3A*` shown above, it may cause unpredictable test failures.
 ### Testing against different regions
 
 S3A can connect to different regions —the tests support this. Simply
-define the target region in `contract-tests.xml` or any `auth-keys.xml`
+define the target region in `contract-test-options.xml` or any `auth-keys.xml`
 file referenced.
 
 ```xml