Fix various documentation, user-facing, and source comment typos (#16367)

* Fix various doc, user-facing, and source comment typos

Found via `codespell -q 3 -S ./options/locale,./vendor -L ba,pullrequest,pullrequests,readby`

modules/validation/helpers.go

@@ -92,7 +92,7 @@ func IsValidExternalURL(uri string) bool {
 		return false
 	}
 
-	// TODO: Later it should be added to allow local network IP addreses
+	// TODO: Later it should be added to allow local network IP addresses
 	//       only if allowed by special setting
 
 	return true