[pr][template] 增加符合RTThread代码规范条款描述

.gitee/PULL_REQUEST_TEMPLATE.en.md

@@ -27,3 +27,4 @@ As part of this pull request, I've considered the following:
 - [ ] All modifications to BSP are justified and do not affect other components or BSPs.
 - [ ] I've commented appropriately where code is tricky.
 - [ ] Code in this PR is of high quality.
+- [ ] This PR complies with [RT-Thread code specification](../documentation/coding_style_en.txt)

.gitee/PULL_REQUEST_TEMPLATE.zh-CN.md

@@ -27,3 +27,4 @@
 - [ ] 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或
 - [ ] 对难懂代码均提供对应的注释
 - [ ] 本拉取/合并请求代码是高质量的
+- [ ] 本拉取/合并符合[RT-Thread代码规范](../documentation/coding_style_cn.md)

.gitee/PULL_REQUEST_TEMPLATE.zh-TW.md

@@ -27,3 +27,4 @@
 - [ ] 所有變更均有原因及合理的，並且不會影響到其他軟件組件代碼或
 - [ ] 對難懂代碼均提供對應的註釋
 - [ ] 本拉取/合並請求代碼是高質量的
+- [ ] 本拉取/合並符合[RT-Thread代碼規範](../documentation/coding_style_cn.md)