[Improvement] Add the issue specifications reference (#3221)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -9,6 +9,8 @@ assignees: ''
 
 *For better global communication, please give priority to using English description, thx! *
 
+*Please review https://dolphinscheduler.apache.org/en-us/docs/development/issue.html when describe an issue.*
+
 **Describe the bug**
 A clear and concise description of what the bug is.
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -9,6 +9,8 @@ assignees: ''
 
 *For better global communication, please give priority to using English description, thx! *
 
+*Please review https://dolphinscheduler.apache.org/en-us/docs/development/issue.html when describe an issue.*
+
 **Describe the feature**
 A clear and concise description of what the feature is.
 

.github/ISSUE_TEMPLATE/improvement_suggestion.md

@@ -9,6 +9,8 @@ assignees: ''
 
 *For better global communication, please give priority to using English description, thx! *
 
+*Please review https://dolphinscheduler.apache.org/en-us/docs/development/issue.html when describe an issue.*
+
 **Describe the question**
 A clear and concise description of what the improvement is.
 

.github/ISSUE_TEMPLATE/question.md

@@ -9,6 +9,8 @@ assignees: ''
 
 *For better global communication, please give priority to using English description, thx! *
 
+*Please review https://dolphinscheduler.apache.org/en-us/docs/development/issue.html when describe an issue.*
+
 **Describe the question**
 A clear and concise description of what the question is.
 

.github/ISSUE_TEMPLATE/test.md

@@ -9,6 +9,8 @@ assignees: ''
 
 *For better global communication, please give priority to using English description, thx! *
 
+*Please review https://dolphinscheduler.apache.org/en-us/docs/development/issue.html when describe an issue.*
+
 **Describe the question**
 A clear and concise description of what the test part is.