Fix typos in comments

Tools/msg/px_generate_uorb_topic_files.py

@@ -173,7 +173,7 @@ def generate_output_from_file(format_idx, filename, outputdir, package, template
 
 def generate_by_template(output_file, template_file, em_globals):
     """
-    Invokes empy intepreter to geneate output_file by the
+    Invokes empy intepreter to generate output_file by the
     given template_file and predefined em_globals dict
     """
     # check if folder exists:

Tools/px4airframes/rcout.py

@@ -47,7 +47,7 @@ def __init__(self, groups, board, post_start=False):
                     continue
 
                 if post_start:
-                    # Path to post-start sript
+                    # Path to post-start script
                     path = airframe.GetPostPath()
                 else:
                     # Path to start script

Tools/px_uploader.py

@@ -296,7 +296,7 @@ def __getSync(self, doFlush=True):
         if c != self.OK:
             raise RuntimeError("unexpected response 0x%x instead of OK" % ord(c))
 
-    # The control flow for reciving Sync is on the order of 16 Ms per Sync
+    # The control flow for receiving Sync is on the order of 16 Ms per Sync
     # This will validate all the SYNC,<results> for a window of programing
     # in about 13.81 Ms for 256 blocks written
     def __ackSyncWindow(self, count):