refactor(handler): rename observers

Rename observers but with backward compatibility, relevant documentation

docs/dispatcher/class_based_handlers/callback_query.md

@@ -8,7 +8,7 @@ from aiogram.handlers import CallbackQueryHandler
 
 ...
 
-@router.callback_query_handler()
+@router.callback_query()
 class MyHandler(CallbackQueryHandler):
     async def handle(self) -> Any: ...
 
@@ -26,4 +26,4 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [CallbackQuery](../../api/types/callback_query.md)
-- [Router.callback_query_handler](../router.md#callback-query)
+- [Router.callback_query](../router.md#callback-query)

docs/dispatcher/class_based_handlers/chosen_inline_result.md

@@ -8,7 +8,7 @@ from aiogram.handlers import ChosenInlineResultHandler
 
 ...
 
-@router.chosen_inline_result_handler()
+@router.chosen_inline_result()
 class MyHandler(ChosenInlineResultHandler):
     async def handle(self) -> Any: ...
 
@@ -25,4 +25,4 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [ChosenInlineResult](../../api/types/chosen_inline_result.md)
-- [Router.chosen_inline_result_handler](../router.md#chosen-inline-query)
+- [Router.chosen_inline_result](../router.md#chosen-inline-query)

docs/dispatcher/class_based_handlers/error.md

@@ -8,7 +8,7 @@ from aiogram.handlers import ErrorHandler
 
 ...
 
-@router.errors_handler()
+@router.errors()
 class MyHandler(ErrorHandler):
     async def handle(self) -> Any:
         log.exception(
@@ -28,5 +28,5 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 ## Related pages
 
 - [BaseHandler](basics.md#basehandler)
-- [Router.errors_handler](../router.md#errors)
+- [Router.errors](../router.md#errors)
 - [Filters](../filters/exception.md)

docs/dispatcher/class_based_handlers/inline_query.md

@@ -7,7 +7,7 @@ from aiogram.handlers import InlineQueryHandler
 
 ...
 
-@router.inline_query_handler()
+@router.inline_query()
 class MyHandler(InlineQueryHandler):
     async def handle(self) -> Any: ...
 

docs/dispatcher/class_based_handlers/message.md

@@ -8,7 +8,7 @@ from aiogram.handlers import MessageHandler
 
 ...
 
-@router.message_handler()
+@router.message()
 class MyHandler(MessageHandler):
     async def handle(self) -> Any:
         return SendMessage(chat_id=self.chat.id, text="PASS")
@@ -26,7 +26,7 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [Message](../../api/types/message.md)
-- [Router.message_handler](../router.md#message)
-- [Router.edited_message_handler](../router.md#edited-message)
-- [Router.channel_post_handler](../router.md#channel-post)
-- [Router.edited_channel_post_handler](../router.md#edited-channel-post)
+- [Router.message](../router.md#message)
+- [Router.edited_message](../router.md#edited-message)
+- [Router.channel_post](../router.md#channel-post)
+- [Router.edited_channel_post](../router.md#edited-channel-post)

docs/dispatcher/class_based_handlers/poll.md

@@ -8,7 +8,7 @@ from aiogram.handlers import PollHandler
 
 ...
 
-@router.poll_handler()
+@router.poll()
 class MyHandler(PollHandler):
     async def handle(self) -> Any: ...
 
@@ -25,4 +25,4 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [Poll](../../api/types/poll.md)
-- [Router.poll_handler](../router.md#poll)
+- [Router.poll](../router.md#poll)

docs/dispatcher/class_based_handlers/pre_checkout_query.md

@@ -8,7 +8,7 @@ from aiogram.handlers import PreCheckoutQueryHandler
 
 ...
 
-@router.pre_checkout_query_handler()
+@router.pre_checkout_query()
 class MyHandler(PreCheckoutQueryHandler):
     async def handle(self) -> Any: ...
 
@@ -24,4 +24,4 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [PreCheckoutQuery](../../api/types/pre_checkout_query.md)
-- [Router.pre_checkout_query_handler](../router.md#pre-checkout-query)
+- [Router.pre_checkout_query](../router.md#pre-checkout-query)

docs/dispatcher/class_based_handlers/shipping_query.md

@@ -8,7 +8,7 @@ from aiogram.handlers import ShippingQueryHandler
 
 ...
 
-@router.shipping_query_handler()
+@router.shipping_query()
 class MyHandler(ShippingQueryHandler):
     async def handle(self) -> Any: ...
 
@@ -24,4 +24,4 @@ This base handler is subclass of [BaseHandler](basics.md#basehandler) with some
 
 - [BaseHandler](basics.md#basehandler)
 - [ShippingQuery](../../api/types/shipping_query.md)
-- [Router.shipping_query_handler](../router.md#shipping-query)
+- [Router.shipping_query](../router.md#shipping-query)