docs(string): fix typo

ruanyf · ruanyf · commit 3e1e1359b59a · 2020-11-17T22:42:25.000+08:00
diff --git a/docs/string.md b/docs/string.md
@@ -505,11 +505,10 @@ function passthru(literals) {
   let i = 0;
 
   while (i < literals.length) {
-    result += literals[i];
+    result += literals[i++];
     if (i < arguments.length) {
       result += arguments[i];
     }
-    i++;
   }
 
   return result;
