message: doc: fix CChainState::ActivateBestChain doc
diff: @@ -678,9 +678,13 @@ public:
  * we avoid holding cs_main for an extended period of time; the length of this
  * call may be quite long during reindexing or a substantial reorg.
  *
  + * May not be called with cs_main held. May not be called in a
  + * validationinterface callback.
  + *
  * @returns true unless a system error occurred
  */
  - bool ActivateBestChain(CValidationState& state,
  + bool ActivateBestChain(
  + CValidationState& state,
  const CChainParams& chainparams,
  std::shared_ptr<const CBlock> pblock) LOCKS_EXCLUDED(cs_main);
  