HADOOP-14464. hadoop-aws doc header warning #5 line wrapped. Contributed by John Zhuge.

(cherry picked from commit 6c6a7a5)

Author: jzhuge

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

@@ -100,8 +100,7 @@ Do not inadvertently share these credentials through means such as
 
 If you do any of these: change your credentials immediately!
 
-### Warning #5: The S3 client provided by Amazon EMR are not from the Apache
-Software foundation, and are only supported by Amazon.
+### Warning #5: The S3 client provided by Amazon EMR are not from the Apache Software foundation, and are only supported by Amazon.
 
 Specifically: on Amazon EMR, s3a is not supported, and amazon recommend
 a different filesystem implementation. If you are using Amazon EMR, follow