Making key-value consistent with rest of Docs.

Author: Oxyjun

src/content/docs/durable-objects/what-are-durable-objects.mdx

@@ -49,9 +49,9 @@ In-memory state is reset when the Durable Object hibernates after being idle for
 
 The [Durable Object Storage API](/durable-objects/api/storage-api/) allows Durable Objects to access fast, transactional, and strongly consistent storage. A Durable Object's attached storage is private to its unique instance and cannot be accessed by other objects.
 
-There are two flavors of the storage API, a [Key-Value (KV) API](/durable-objects/api/storage-api/#methods) and an [SQL API](/durable-objects/api/sql-storage/).
+There are two flavors of the storage API, a [key-value (KV) API](/durable-objects/api/storage-api/#methods) and an [SQL API](/durable-objects/api/sql-storage/).
 
-When using the [new SQLite in Durable Objects storage backend](/durable-objects/reference/durable-objects-migrations/#enable-sqlite-storage-backend-on-new-durable-object-class-migration), you have access to both the APIs. However, if you use the previous storage backend you only have access to the Key-Value API.
+When using the [new SQLite in Durable Objects storage backend](/durable-objects/reference/durable-objects-migrations/#enable-sqlite-storage-backend-on-new-durable-object-class-migration), you have access to both the APIs. However, if you use the previous storage backend you only have access to the key-value API.
 
 ### Alarms API