Update docs/features/marks.md

Author: Fil

docs/features/marks.md

@@ -553,7 +553,7 @@ All marks support the following [transform](./transforms.md) options:
 
 The **sort** option, when not specified as a channel value (such as a field name or an accessor function), can also be used to [impute ordinal scale domains](./scales.md#sort-mark-option).
 
-The **render** option allows to override or extend the default mark’s rendering method. See [extengin Plot](./extensions.md#render) for details.
+The **render** option allows to override or extend the default mark’s rendering method. See [extending Plot](./extensions.md#render) for details.
 
 ## marks(...*marks*) <VersionBadge version="0.2.0" /> {#marks}