Reference professional.wiki documentation page (#81)

Author: JeroenDeDauw

extension.json

@@ -5,7 +5,7 @@
 
 	"author": [
 		"[https://www.EntropyWins.wtf/mediawiki Jeroen De Dauw]",
-		"[https://professional.wiki/ Professional.Wiki]"
+		"[https://professional.wiki/ Professional Wiki]"
 	],
 
 	"url": "https://professional.wiki/en/extension/external-content",