Add example for new lint

Author: Bisaloo

R/sprintf_linter.R

@@ -12,6 +12,11 @@
 #'   linters = sprintf_linter()
 #' )
 #'
+#' lint(
+#'   text = 'sprintf("hello")',
+#'   linters = sprintf_linter()
+#' )
+#'
 #' # okay
 #' lint(
 #'   text = 'sprintf("hello %s %s %d", x, y, z)',