fix grammar issue in a comment
Fixed some syntax errors in the comments
@@ -1273,7 +1273,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
}
}
/* Just for the sake of defensive programming, to avoid forgetting to
- * call this function when need. */
+ * call this function when needed. */
updateDictResizePolicy();
