Update comments

ConflictSet.cpp

@@ -1177,9 +1177,10 @@ consumePartialKey(Node *&self, std::span<const uint8_t> &key,
   }
 }
 
-// Caller is responsible for assigning a non-null pointer to the returned
-// reference if null. Updates child's max version to `newMaxVersion` if child
-// exists but does not have a partial key.
+// Return the next node along the search path of key, consuming bytes of key
+// such that the search path of the result + key is the same as the search path
+// of self + key before the call. Creates a node if necessary. Updates
+// `maxVersion` for result.
 Node *&getOrCreateChild(Node *&self, std::span<const uint8_t> &key,
                         InternalVersionT newMaxVersion, WriteContext *tls) {