Update src/messaging/ReliableMessageAnalyticsDelegate.h

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

Author: tehampson

src/messaging/ReliableMessageAnalyticsDelegate.h

@@ -68,7 +68,7 @@ class ReliableMessageAnalyticsDelegate
         // this value will be 0.
         uint32_t messageCounter = 0;
         // If the eventType is kRetransmission, this value will be populated with the number of the
-        // retransmission attempt. A value of 1 indicates the first retransmission. This value should never
+        // retransmission attempt. A value of 1 indicates the first retransmission (i.e. the second transmission of the message). This value should never
         // be 0.
         std::optional<uint8_t> retransmissionCount;
     };