[KV]Update write-key-value-pairs.mdx

Per common in our docs, can we use MB for megabytes here as well?

Author: nenizera

src/content/docs/kv/api/write-key-value-pairs.mdx

@@ -88,7 +88,7 @@ Write more than one key-value pair at a time with Wrangler or [via the REST API]
 
 The bulk API can accept up to 10,000 KV pairs at once.
 
-A `key` and a `value` are required for each KV pair. The entire request size must be less than 100 megabytes. Bulk writes are not supported using the [KV binding](/kv/concepts/kv-bindings/).
+A `key` and a `value` are required for each KV pair. The entire request size must be less than 100 MB. Bulk writes are not supported using the [KV binding](/kv/concepts/kv-bindings/).
 
 ### Expiring keys