Merge pull request #3087 from kevinsimper/patch-1

Update dns help with a correct domain name

core/commands/dns.go

@@ -26,7 +26,7 @@ This command resolves those links to the referenced object.
 
 For example, with this DNS TXT record:
 
-	> dig +short TXT ipfs.io
+	> dig +short TXT _dnslink.ipfs.io
 	dnslink=/ipfs/QmRzTuh2Lpuz7Gr39stNr6mTFdqAghsZec1JoUnfySUzcy
 
 The resolver will give: