[docs] Refine documents for commit message tags. (#7215)

docs/en/developer-guide/commit-format-specification.md

@@ -39,18 +39,18 @@ Commit is divided into ‘ title ’ and ‘ content ’ , the title should be l
 
         The types of this pull request are limited to the following types (all lowercase)
         
-        * fix：Bug fix
-        * feat-new：New function
-        * feat-opt：Optimization and improvement of original functions
-        * docs：Documents
-        * style：Code style adjustment
-        * typo：Code or Document correction
-        * refactor：Code refactoring (no function changes involved)
-        * optimize：Performance optimization
-        * test：Addition or repair of unit test
-        * chore：Modification of build tool
-        * revert：revert
-        * deps：Modification of third-party dependency Library
+        * fix: Bug fix
+        * feature: New feature
+        * improvement: Optimization and improvement for the original feature. 
+        * docs: Documents
+        * style: Code style adjustment
+        * typo: Code or Document correction
+        * refactor: Code refactoring (no function changes involved)
+        * performance: Performance optimization
+        * test: Addition or repair of unit test
+        * chore: Modification of build tool
+        * revert: Revert a previous commit
+        * deps: Modification of third-party dependency Library
 
         Some tips：
         
@@ -157,4 +157,4 @@ Commit is divided into ‘ title ’ and ‘ content ’ , the title should be l
     
     In my test, loading a table with 48 buckets, mem limit 2G, in previous version,
     the average memtable size is 44MB, after modification, the average size is 82MB
-    ```
+    ```

docs/zh-CN/developer-guide/commit-format-specification.md

@@ -38,13 +38,13 @@ Commit 分为“标题”和“内容”。原则上标题全部小写。内容
         本次提交的类型，限定在以下类型（全小写）
         
         * fix：bug修复
-        * feat-new：新增功能
-        * feat-opt：原有功能的优化和改进
+        * feature：新增功能
+        * improvement：原有功能的优化和改进
         * docs：文档
         * style：代码风格调整
         * typo：代码或文档勘误
         * refactor：代码重构（不涉及功能变动）
-        * optimize：性能优化
+        * performance：性能优化
         * test：单元测试的添加或修复
         * chore：构建工具的修改
         * revert：回滚