Update documentation/docs/extending/datasource.mdx

Co-authored-by: Håkon Flatval <70905152+haakonflatval-cognite@users.noreply.github.com>

documentation/docs/extending/datasource.mdx

@@ -55,7 +55,7 @@ class CdfModelIdentifier implements ModelIdentifier {
 | `getModelOutputs()`     | Yes                                        | Returns an object describing the set of valid formats and version for the given model |
 
 `getModelUri()` returns a "base URL" that will be passed to `ModelDataProvider.getBinaryFile()` and `getJsonFile()`. Note that
-its up to `ModelDataProvider` how this base URL is handled and it is possible to use this base URL as 
+it's up to `ModelDataProvider` how this base URL is handled and it is possible to use this base URL as 
 some other identifier, e.g. a folder on disk or ID of a blob storage. `getModelUri()` accepts `BlobOutputMetadata` as input which 
 defines the format, version, and if applicable, the "blob id" of the output.