MyFirstContribution: add tip to confirm patches reached the mailing list

After explaining how to send patches using `git send-email`, give a tip
for contributors on how to confirm that their patches were successfully
sent and appeared on the mailing list. This provides reassurance for
newcomers and helps them verify their submission.

Signed-off-by: Queen Ediri Jessa <qjessa662@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: QueenJcloud

Documentation/MyFirstContribution.adoc

@@ -1158,6 +1158,13 @@ prompt for each patch that's about to go out. This gives you one last chance to
 edit or quit sending something (but again, don't edit code this way). Once you
 press `y` or `a` at these prompts your emails will be sent! Congratulations!
 
+[TIP]
+====
+After sending your patches, you can confirm that they reached the mailing list
+by visiting https://lore.kernel.org/git/. Use the search bar to find your name
+or the subject of your patch. If it appears, your email was successfully delivered.
+====
+
 Awesome, now the community will drop everything and review your changes. (Just
 kidding - be patient!)