fix: preview doc

Author: andreaangiolillo

tools/cli/internal/openapi/filter/bump.go

@@ -31,8 +31,9 @@ const (
 	stateFieldValueUpcoming = "UPCOMING"
 	stateFieldValuePreview  = "PREVIEW"
 	betaFieldName           = "x-beta"
-	description             = "This API is in preview. Breaking changes might be introduced before it is released. " +
-		"Don't use preview APIs in production."
+	description             = `This API is in preview. Breaking changes might be introduced before it is released. Don't use preview APIs in production.
+
+`
 )
 
 func (f *BumpFilter) ValidateMetadata() error {