docs: clarify autoawait example requires running event loop#15216
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Fixes #14865.
The
aiohttp.ClientSession()example inautoawait.rstraisesRuntimeError: no running event loopbecause cellIn [1]contains noawait, so IPython has not yet started the loop whenClientSession()is constructed.Per @Carreau's suggestion on the issue ("the easier way to force a loop is to await a dummy thing, like
await sleep(0)"), this prependsawait asyncio.sleep(0)to the first cell and adds a short note explaining why it is needed.