Update content/docs/guides/mediawiki-tabular-data.md

Co-authored-by: Peter Desmet <peter.desmet.work@gmail.com>

content/docs/guides/mediawiki-tabular-data.md

@@ -28,7 +28,7 @@ MediaWiki Tabular Data has three required and two optional top-level properties.
 | [data](https://www.mediawiki.org/wiki/Help:Tabular_data#Top-level_fields) (required)                                                       | [data](/standard/data-resource/#name) (optional)                                      |
 | [license](https://www.mediawiki.org/wiki/Help:Tabular_data#Top-level_fields) (required) is the string `CC0-1.0` or another known identifier | [licenses](/standard/data-resource/#licenses) (optional) is an array                  |
 | [schema](https://www.mediawiki.org/wiki/Help:Tabular_data#Top-level_fields) (required) as [described below](#schema-properties)            | [schema](/standard/data-resource/#schema) (optional) can have multiple forms          |
-| [sources](https://www.mediawiki.org/wiki/Help:Tabular_data#Top-level_fields) (optional) is a string with Wiki markup                       | [sources](/standard/data-resource/#sources) (optional) is a an array of objects       |
+| [sources](https://www.mediawiki.org/wiki/Help:Tabular_data#Top-level_fields) (optional) is a string with Wiki markup                       | [sources](/standard/data-resource/#sources) (optional) is an array of objects       |
 
 The differences are: