update develop guidelines link.

.github/ISSUE_TEMPLATE/enhancement_request.yml

@@ -42,7 +42,7 @@ body:
       label: Enhancement Request
       description: Describe the suggestion.
       placeholder: >
-        First of all: Have you checked the docs https://hippo4j.cn/community/category/贡献规约,
+        First of all: Have you checked the docs https://hippo4j.cn/community/dev_convention/code,
         or GitHub issues whether someone else has already reported your issue?
     validations:
       required: true

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -42,7 +42,7 @@ body:
       label: Feature Request
       description: Describe the feature.
       placeholder: >
-        First of all: Have you checked the docs https://hippo4j.cn/community/category/贡献规约,
+        First of all: Have you checked the docs https://hippo4j.cn/community/dev_convention/code,
         or GitHub issues whether someone else has already reported your issue?
         Maybe the feature already exists?
     validations:

.github/ISSUE_TEMPLATE/unit_test.yml

@@ -41,7 +41,7 @@ body:
     attributes:
       label: Read the unit testing guidelines
       description: >
-        Read the [develop guidelines](https://hippo4j.cn/community/category/贡献规约) before writing unit test code.
+        Read the [develop guidelines](https://hippo4j.cn/community/dev_convention/code) before writing unit test code.
       options:
         - label: >
             I have read.