By Daniel Bates Celtics legend Paul Pierce was one of many Boston fans over the moon to see their team topple the Heat in the final seconds of Game 7. The Hall of Fame swingman hopped on Twitter Sunday night to let the world know. Tweeting, “Yes siiiiiiiiiiiirrrrrrrrrrr.” The post received thousands of likes from folks on NBA Twitter. “The Truth has spoken!” one user replied. “Yes!” “YESSIRSKIIIII.” “TALK TO EM P!!!” another fan replied in all-caps. “Lmaoooooo go head then Paul,” another laughed. The Celtics are headed back to their first NBA Finals since The Truth was wearing No. 34 in green …