Merge pull request #389 from Yilia05/patch-1

Update 剑指 offer 题解.md

notes/剑指 offer 题解.md

@@ -230,7 +230,7 @@ Output:
 ```java
 public String replaceSpace(StringBuffer str) {
     int P1 = str.length() - 1;
-    for (int i = 0; i < str.length(); i++)
+    for (int i = 0; i < P1+1; i++)
         if (str.charAt(i) == ' ')
             str.append("aa");