Update TypedInput docs for node type filter

[knolleary]

node-red/node-red#5154

[Vasuuu641]

Hi Node-RED team! 👋

I’m new to open source and Node-RED, and I wanted to contribute by documenting the nodeTypeFilter option for TypedInput.

I’ve drafted an example and explanation and plan to open a PR soon. Any feedback or guidance would be really appreciated!