[Service Bus] Doc Updates For Message Browsing (Azure#28209)

* doc updates

* Jesses feedback

* trailing whitespace

Author: kashifkhan

sdk/servicebus/azure-servicebus/azure/servicebus/_servicebus_receiver.py

@@ -783,8 +783,10 @@ def peek_messages(
         Peeked messages are not removed from queue, nor are they locked. They cannot be completed,
         deferred or dead-lettered.
 
-        :param int max_message_count: The maximum number of messages to try and peek. The default
-         value is 1.
+        For more information about message browsing see https://aka.ms/azsdk/servicebus/message-browsing
+
+        :param int max_message_count: The maximum number of messages to try and peek. The actual number of messages
+         returned may be fewer and are subject to service limits. The default value is 1.
         :keyword int sequence_number: A message sequence number from which to start browsing messages.
         :keyword Optional[float] timeout: The total operation timeout in seconds including all the retries.
          The value must be greater than 0 if specified. The default value is None, meaning no timeout.

sdk/servicebus/azure-servicebus/azure/servicebus/aio/_servicebus_receiver_async.py

@@ -770,8 +770,10 @@ async def peek_messages(
         Peeked messages are not removed from queue, nor are they locked. They cannot be completed,
         deferred or dead-lettered.
 
-        :param int max_message_count: The maximum number of messages to try and peek. The default
-         value is 1.
+        For more information about message browsing see https://aka.ms/azsdk/servicebus/message-browsing
+
+        :param int max_message_count: The maximum number of messages to try and peek. The actual number of messages
+         returned may be fewer and are subject to service limits. The default value is 1.
         :keyword int sequence_number: A message sequence number from which to start browsing messages.
         :keyword Optional[float] timeout: The total operation timeout in seconds including all the retries.
          The value must be greater than 0 if specified. The default value is None, meaning no timeout.