dddd9270f85bd2e71fd281a0c6b4053e02fce93c net: Document what happens to getdata of unknonw type (MarcoFalke)
Pull request description:
Any getdata of unknown type will never be processed and blocks all future messages from a peer. This isn't obviously clear from reading the code, so document it.
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Backport of Core PR16188
Adjusted the second comment to actually make sense.