minor doc changes

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

@@ -69,20 +69,50 @@ implement `software.amazon.awssdk.auth.credentials.AwsCredentialsProvider` inste
 [HADOOP-18980](https://issues.apache.org/jira/browse/HADOOP-18980) introduces extended version of
 the credential provider remapping. `fs.s3a.aws.credentials.provider.mapping` can be used to
 list comma-separated key-value pairs of mapped credential providers that are separated by
-equal operator (=). The key can be used by `fs.s3a.aws.credentials.provider` config, and it
-will be translated into the specified value of credential provider class based on the key-value
-pair provided by this config.
+equal operator (=).
+The key can be used by `fs.s3a.aws.credentials.provider` or
+`fs.s3a.assumed.role.credentials.provider` configs, and the key will be translated into
+the specified value of credential provider class based on the key-value pair
+provided by the config `fs.s3a.aws.credentials.provider.mapping`.
 
 For example, if `fs.s3a.aws.credentials.provider.mapping` is set with value:
 
+```xml
+<property>
+  <name>fs.s3a.aws.credentials.provider.mapping</name>
+  <vale>
     com.amazonaws.auth.AnonymousAWSCredentials=org.apache.hadoop.fs.s3a.AnonymousAWSCredentialsProvider,
     com.amazonaws.auth.EC2ContainerCredentialsProviderWrapper=org.apache.hadoop.fs.s3a.auth.IAMInstanceCredentialsProvider,
     com.amazonaws.auth.InstanceProfileCredentialsProvider=org.apache.hadoop.fs.s3a.auth.IAMInstanceCredentialsProvider
+  </vale>
+</property>
+```
+
+and if `fs.s3a.aws.credentials.provider` is set with:
+
+```xml
+<property>
+  <name>fs.s3a.aws.credentials.provider</name>
+  <vale>com.amazonaws.auth.AnonymousAWSCredentials</vale>
+</property>
+```
 
-With the above key-value pairs, if `fs.s3a.aws.credentials.provider` specifies
-`com.amazonaws.auth.AnonymousAWSCredentials`, it will be remapped to
+`com.amazonaws.auth.AnonymousAWSCredentials` will be internally remapped to
 `org.apache.hadoop.fs.s3a.AnonymousAWSCredentialsProvider` by S3A while preparing
-AWS credential provider list.
+the AWS credential provider list.
+
+Similarly, if `fs.s3a.assumed.role.credentials.provider` is set with:
+
+```xml
+<property>
+  <name>fs.s3a.assumed.role.credentials.provider</name>
+  <vale>com.amazonaws.auth.InstanceProfileCredentialsProvider</vale>
+</property>
+```
+
+`com.amazonaws.auth.InstanceProfileCredentialsProvider` will be internally
+remapped to `org.apache.hadoop.fs.s3a.auth.IAMInstanceCredentialsProvider` by
+S3A while preparing the assumed role AWS credential provider list.
 
 
 ### Original V1 `AWSCredentialsProvider` interface