Update building_block_commands.md

docs/bot_tutorial/building_block_commands.md

@@ -57,8 +57,8 @@ def on_tag_command(self, event, name, value=None):
       return event.msg.reply('Unknown tag: `{}`'.format(name))
 ```
 
-A different way of adding arguments to a command is by using argparse.ArgumentParser. With agparser it's easier to create more complicated commands with many options or flags.
-Right here, we'll recreate our math add command, but using agparser.
+A different way of adding arguments to a command is by using argparse.ArgumentParser. With argparser it's easier to create more complicated commands with many options or flags.
+Right here, we'll recreate our math add command, but using argparser.
 ```py
 @Plugin.command('add', parser=True, group='math')
 @Plugin.parser.add_argument('a', type=int)