Update Lib/pdb.py

Co-authored-by: AN Long <aisk@users.noreply.github.com>

Author: cocolato

Lib/pdb.py

@@ -1319,7 +1319,7 @@ def do_commands(self, arg):
                 if bdb.Breakpoint.bpbynumber[bnum] is not None:
                     break
                 if bnum == 0:
-                    self.error('no breakpoints setted')
+                    self.error('no breakpoints set')
                     return
         else:
             try: