Small grammar correction (SharePoint#4576)

"Actions can be run" instead of "Actions can be runned"

Author: simoncrelling

docs/declarative-customization/site-design-json-schema.md

@@ -27,7 +27,7 @@ The overall JSON structure is specified as follows:
 You can view - and reference - the latest schema here: https://developer.microsoft.com/json-schemas/sp/site-design-script-actions.schema.json
 
 #### Applying site designs multiple times
-**Actions** can be runned more than once on a site. Rerunning **actions** on the same site with the same parameters will result in an update to the existing schema and not duplication of schema. 
+**Actions** can be run more than once on a site. Rerunning **actions** on the same site with the same parameters will result in an update to the existing schema and not duplication of schema. 
 
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