fix #660 modify Chinese annotations to English (#661)

Author: xiaoheng1

jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/storage/Sequence.java

@@ -37,14 +37,14 @@ public Sequence(long startValue, long endValue) {
     }
 
     /**
-     * 可用的最小值, 包含 [startValue, endValue)
+     * The available minimum value, including [startValue, endValue)
      */
     public long getStartValue() {
         return startValue;
     }
 
     /**
-     * 可用的最大值, 不包含 [startValue, endValue)
+     * The available maximum value, not including [startValue, endValue)
      */
     public long getEndValue() {
         return endValue;