Fix javadoc (#5932)

Javadoc for the class references itself, but should be referencing
InputStreamEntity, which is what it actually delegates to.

Author: dagnir

http-clients/apache-client/src/main/java/software/amazon/awssdk/http/apache/internal/RepeatableInputStreamRequestEntity.java

@@ -32,7 +32,7 @@
 
 /**
  * Custom implementation of {@link org.apache.http.HttpEntity} that delegates to an
- * {@link RepeatableInputStreamRequestEntity}, with the one notable difference, that if
+ * {@link InputStreamEntity}, with the one notable difference, that if
  * the underlying InputStream supports being reset, this RequestEntity will
  * report that it is repeatable and will reset the stream on all subsequent
  * attempts to write out the request.