Doc: fix create B2 repository cmd
Fix command line: "create" instead of "connect"
@@ -95,7 +95,7 @@ $ kopia repository connect s3
You will need your B2 bucket name, key-id and key.
```shell
-$ kopia repository connect b2 \
+$ kopia repository create b2 \
--bucket=... \
--key-id=... \
--key=...
