doc: release note for new getpeerinfo fields "bip152_hb_{from,to}"

Co-authored-by: Jon Atack <jon@atack.com>

doc/release-notes-19776.md

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+Updated RPCs
+------------
+
+- The `getpeerinfo` RPC returns two new boolean fields, `bip152_hb_to` and
+  `bip152_hb_from`, that respectively indicate whether we selected a peer to be
+  in compact blocks high-bandwidth mode or whether a peer selected us as a
+  compact blocks high-bandwidth peer. High-bandwidth peers send new block
+  announcements via a `cmpctblock` message rather than the usual inv/headers
+  announcements. See BIP 152 for more details. (#19776)