gh-150345: Fix incorrect reference in BaseSelectorEventLoop docstring

[kodsurfer]

Summary

Fix wrong class reference in BaseSelectorEventLoop docstring.

Details

The docstring in asyncio.selector_events.BaseSelectorEventLoop incorrectly
references events.EventLoop, which does not exist in the module.
events.AbstractEventLoop is the correct reference.

Changes

Changed docstring reference from events.EventLoop to events.AbstractEventLoop

Issue

This fixes the documentation issue where:

events.EventLoop doesn't exist as an attribute on asyncio.events
asyncio.EventLoop (added in Python 3.13) is a platform-specific concrete implementation alias, not an API specification
AbstractEventLoop is the appropriate class for API specification documentation

Issue: #150345

• Issue: Reference to non-existent asyncio.events.EventLoop in asyncio.selector_events source #150345

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