docs: remove peer-id-factory #3563

Job	Run time
Build	3m 4s
Test example js-libp2p-example-browser-pubsub	3m 38s
Test example js-libp2p-example-chat	1m 51s
Test example js-libp2p-example-circuit-relay	3m 50s
Test example js-libp2p-example-connection-encryption	1m 2s
Test example js-libp2p-example-custom-protocols	1m 1s
Test example js-libp2p-example-delegated-routing	4m 1s
Test example js-libp2p-example-discovery-mechanisms	3m 55s
Test example js-libp2p-example-peer-and-content-routing	1m 42s
Test example js-libp2p-example-pnet	1m 40s
Test example js-libp2p-example-protocol-and-stream-muxing	2m 56s
Test example js-libp2p-example-pubsub	1m 22s
Test example js-libp2p-example-transports	1m 26s
Test example js-libp2p-example-webrtc-private-to-private	3m 50s
	35m 18s

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