[skip ci]Update issue templates (#6584)

Signed-off-by: Xiangyu Wang <xiangyu.wang@zilliz.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: "\U0001F41B Bug report"
 about: Create a bug report to help us improve Milvus
 title: ''
-labels: needs-triage
+labels: kind/bug, needs-triage
 assignees: ''
 
 ---
@@ -29,3 +29,4 @@ assignees: ''
 
 
 #### Additional context:
+

.github/ISSUE_TEMPLATE/documentation-request.md

@@ -1,35 +0,0 @@
----
-name: "\U0001F4DD Documentation request"
-about: Report incorrect or needed documentation
-title: ''
-labels: ''
-assignees: ''
-
----
-
-**Please state your issue using the following template and, most importantly, in English.**
-
-**Location of incorrect documentation**
-Provide links and line numbers if applicable.
-
-**Describe the problems or issues found in the documentation**
-A clear and concise description of what you found to be incorrect.
-
-**Steps taken to verify documentation is incorrect**
-List any steps you have taken:
-
-**Suggested fix for documentation**
-Detail proposed changes to fix the documentation if you have any.
-
----
-
-## Report needed documentation
-
-**Report needed documentation**
-A clear and concise description of what documentation you believe it is needed and why.
-
-**Describe the documentation you'd like**
-A clear and concise description of what you want to happen.
-
-**Steps taken to search for needed documentation**
-List any steps you have taken:

.github/ISSUE_TEMPLATE/enhancement.md

@@ -1,14 +1,14 @@
 ---
 name: Enhancement request
-about: Suggest an enhancement idea for Milvus
+about: As a developer, I want to make an enhancement for Milvus
 title: ''
-labels: ''
+labels: kind/enhancement
 assignees: ''
 
 ---
 
-**Please state your issue using the following template and, most importantly, in English.**
+<!-- Please state your issue using the following template and, most importantly, in English. -->
+#### What would you like to be added:
 
-**What would you like to be added ?**
+#### Why is this needed:
 
-**Why is this needed ?**

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,22 +1,21 @@
 ---
 name: "\U0001F680 Feature request"
-about: Suggest an idea for Milvus
+about: As a user, I want to request a feature for Milvus
 title: ''
-labels: ''
+labels: kind/feature
 assignees: ''
 
 ---
 
-**Please state your issue using the following template and, most importantly, in English.**
+<!-- Please state your issue using the following template and, most importantly, in English. -->
+#### Is your feature request related to a problem? Please describe:
 
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. E.g. I wish I could use Milvus to do [...]
 
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
+#### Describe the solution you'd like:
 
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
-Add any other context, code examples, or references to existing implementations about the feature request here.
+#### Describe alternatives you've considered:
+
+
+#### Additional context:
+