fix(guide): simplify directory structure

guide/english/javascript/standard-objects/string/string-fromcharcode/index.md

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+---
+title: String fromCharCode
+---
+The static `String.fromCharCode()` method returns a string created by using the specified sequence of Unicode values.
+
+## Syntax
+
+    String.fromCharCode(num1[, ...[, numN]])
+
+### Parameters
+
+**num1, ..., numN**
+
+A sequence of numbers that are Unicode values.
+
+<a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode' target='_blank' rel='nofollow'>MDN link</a> | <a href='https://msdn.microsoft.com/en-us/LIBRary/wb4w0k66%28v=vs.94%29.aspx' target='_blank' rel='nofollow'>MSDN link</a>
+
+## Description
+
+This method returns a string and not a String object.
+
+Because `fromCharCode()` is a static method of String, you always use it as `String.fromCharCode()`, rather than as a method of a String object you created.
+
+## Examples
+
+    String.fromCharCode(65, 66, 67);  // "ABC"
+
+    var test = String.fromCharCode(112, 108, 97, 105, 110);
+    document.write(test);
+
+    // Output: plain