misc: code consistency and bot instance creation (#1482)

* misc: code consistency and bot instance creation

* Changelog for aiogram#1482

* misc: consistency of comments and dispatcher instance creation

* misc: removed routers example

* Update CHANGES/1482.misc.rst

---------

Co-authored-by: Alex Root Junior <jroot.junior@gmail.com>

examples/echo_bot_webhook.py

@@ -7,7 +7,8 @@ from os import getenv
 
 from aiohttp import web
 
-from aiogram import Bot, Dispatcher, Router, types
+from aiogram import Bot, Dispatcher, Router
+from aiogram.client.default import DefaultBotProperties
 from aiogram.enums import ParseMode
 from aiogram.filters import CommandStart
 from aiogram.types import Message
@@ -29,7 +30,7 @@ WEBHOOK_PATH = "/webhook"
 WEBHOOK_SECRET = "my-secret"
 # Base URL for webhook will be used to generate webhook URL for Telegram,
 # in this example it is used public DNS with HTTPS support
-BASE_WEBHOOK_URL = "https://aiogram.dev/"
+BASE_WEBHOOK_URL = "https://aiogram.dev"
 
 # All handlers should be attached to the Router (or Dispatcher)
 router = Router()
@@ -49,7 +50,7 @@ async def command_start_handler(message: Message) -> None:
 
 
 @router.message()
-async def echo_handler(message: types.Message) -> None:
+async def echo_handler(message: Message) -> None:
     """
     Handler will forward receive a message back to the sender
 
@@ -78,8 +79,8 @@ def main() -> None:
     # Register startup hook to initialize webhook
     dp.startup.register(on_startup)
 
-    # Initialize Bot instance with a default parse mode which will be passed to all API calls
-    bot = Bot(TOKEN, parse_mode=ParseMode.HTML)
+    # Initialize Bot instance with default bot properties which will be passed to all API calls
+    bot = Bot(token=TOKEN, default=DefaultBotProperties(parse_mode=ParseMode.HTML))
 
     # Create aiohttp.web.Application instance
     app = web.Application()