doc: fix typo and update incorrect comment

src/init.cpp

@@ -301,7 +301,7 @@ void Shutdown(NodeContext& node)
         DumpMempool(*node.mempool, MempoolPath(*node.args));
     }
 
-    // Drop transactions we were still watching, record fee estimations and Unregister
+    // Drop transactions we were still watching, record fee estimations and unregister
     // fee estimator from validation interface.
     if (node.fee_estimator) {
         node.fee_estimator->Flush();

src/validationinterface.h

@@ -150,7 +150,7 @@ protected:
     virtual void BlockConnected(ChainstateRole role, const std::shared_ptr<const CBlock> &block, const CBlockIndex *pindex) {}
     /**
      * Notifies listeners of a block being disconnected
-     *  Provides the block that was connected.
+     * Provides the block that was disconnected.
      *
      * Called on a background thread. Only called for the active chainstate, since
      * background chainstates should never disconnect blocks.