Add autogenerated docs for types and methods

docs/api/methods/get_chat_members_count.md

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+# getChatMembersCount
+
+## Description
+
+Use this method to get the number of members in a chat. Returns Int on success.
+
+
+## Arguments
+
+| Name | Type | Description |
+| - | - | - |
+| `chat_id` | `#!python3 Union[int, str]` | Unique identifier for the target chat or username of the target supergroup or channel (in the format @channelusername) |
+
+
+
+## Response
+
+Type: `#!python3 int`
+
+Description: Returns Int on success.
+
+
+## Usage
+
+
+### As bot method bot
+
+```python3
+result: int = await bot.get_chat_members_count(...)
+```
+
+### Method as object
+
+Imports:
+
+- `from aiogram.types import GetChatMembersCount`
+- `from aiogram.api.types import GetChatMembersCount`
+- `from aiogram.api.types.get_chat_members_count import GetChatMembersCount`
+
+
+#### With specific bot
+```python3
+result: int = await bot.emit(GetChatMembersCount(...))
+```
+
+#### In handlers with current bot
+```python3
+result: int = await GetChatMembersCount(...)
+```
+
+
+## Related pages:
+
+- [Official documentation](https://core.telegram.org/bots/api#getchatmemberscount)