Clarify documentation for JetStreamSubscription

[davidmorley]

Fix javadoc for fetch() maxWait parameter

Problem

The current javadoc for the maxWait parameter in both fetch() method overloads incorrectly states that it's "the maximum time to wait for the first message." This is misleading as it suggests the timeout only applies to receiving the initial message.

Solution

Updated the parameter descriptions to clarify that maxWait/maxWaitMillis is "the maximum time to wait to collect messages for the batch," which accurately reflects that the timeout governs the entire batch collection operation.

Changes

• Updated @param maxWait description in javadoc for fetch(int batchSize, Duration maxWait) method
• Updated @param maxWaitMillis description in javadoc for fetch(int batchSize, long maxWaitMillis) method

This change improves API documentation clarity for developers using JetStream pull subscriptions.

[scottf]

Good clarification