doc: fix `BlockConnected` incorrect comment #32893

This is a simple PR that fixes the BlockConnected validation interface notification comment, which incorrectly states that a vector of transactions removed from the mempool is as a parameter of the method.

Originally, this was the case when the method was first introduced in #9725

However, the method has since changed, and this is no longer accurate. Keeping the outdated comment is now misleading.

This PR removes the information about the method parameters from the docstring, aligning it with the style of other notifications methods. As noticed in this PR, comments listing parameters can become stale and go uncorrected.

Therefore, this PR simply removes the inaccurate comment without listing the current returned values.

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32893.

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Vector parameter was removed in https://github.com/bitcoin/bitcoin/commit/cdb893443cc16edf974f099b8485e04b3db1b1d7#diff-b169bd0694e8b0a87fd1097c8cfc1d6c8a926b49b375bb4141d37dcc624f975eL127-L131, the doc wasn't updated.

ACK 4e69aa5701a2dad3805ea26718e6a406adb8b748

lgtm ACK 4e69aa5701a2dad3805ea26718e6a406adb8b748