Update table_block.md (#11474)

* Correct `mergeCells` option.

CONTRIBUTORS.md

@@ -783,6 +783,7 @@
 * Vaishnav Dasari
 * Aditya
 * Tommaso Amici
+* Curtis Maloney
 
 ## Translators
 

docs/reference/contrib/table_block.md

@@ -103,7 +103,7 @@ Every key in the `table_options` dictionary maps to a [handsontable](https://han
 -   [language](https://handsontable.com/docs/6.2.2/Options.html#language) - The default language setting. By default TableBlock tries to get the language from `django.utils.translation.get_language`. If needed, this setting can be overridden here.
 -   [renderer](https://handsontable.com/docs/6.2.2/Options.html#renderer) - The default setting Handsontable uses to render the content of table cells.
 -   [autoColumnSize](https://handsontable.com/docs/6.2.2/Options.html#autoColumnSize) - Enables or disables the `autoColumnSize` plugin. The TableBlock default setting is `False`.
--   [mergedCells](https://handsontable.com/docs/6.2.0/Options.html#mergeCells) - Can be set to `True` or `False`, determined if merging cells is allowed. Remember to add `'mergeCells'` to the `'contextMenu'` option also.
+-   [mergeCells](https://handsontable.com/docs/6.2.0/Options.html#mergeCells) - Can be set to `True` or `False`, determined if merging cells is allowed. Remember to add `'mergeCells'` to the `'contextMenu'` option also.
 
 A [complete list of handsontable options](https://handsontable.com/docs/6.2.2/Options.html) can be found on the Handsontable website.