Update properties files with correct property name

amazon-kinesis-client-multilang/src/test/resources/multilangv3.properties

@@ -17,10 +17,12 @@ streamName = kclpysample
 applicationName = MultiLangTest
 
 # Users can change the credentials provider the KCL will use to retrieve credentials.
-# The DefaultAWSCredentialsProviderChain checks several other providers, which is
+# Expected key name (case-sensitive):
+# AwsCredentialsProvider / AwsCredentialsProviderDynamoDB / AwsCredentialsProviderCloudWatch
+# The DefaultCredentialsProvider checks several other providers, which is
 # described here:
-# http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html
-AWSCredentialsProvider = DefaultAWSCredentialsProviderChain
+# https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/auth/credentials/DefaultCredentialsProvider.html
+AwsCredentialsProvider = DefaultCredentialsProvider
 
 # Appended to the user agent of the KCL. Does not impact the functionality of the
 # KCL in any other way.