fix(rdb): typo (#5291)

Author: SamyOubouaziz

pages/managed-databases-for-postgresql-and-mysql/how-to/change-volume-type.mdx

@@ -52,7 +52,7 @@ Since there are different types of volumes for Database Instances, make sure you
 
 During the process:
 
-- The Database Instance will display the `initializing` status, but remains available available.
+- The Database Instance will display the `initializing` status, but remains available.
 - Changing the volume type can take a while, depending on the amount of data and the node type of the Database Instance. Data is synchronized between nodes in live, which means you can continue performing write operations.
     <Message type="tip">
       - Avoid performing too many write operations during the data synchronization.