Update issue templates

Signed-off-by: David Ko <dko@suse.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,25 +7,29 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+## Describe the bug
+
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+## To Reproduce
+
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Perform '....'
 4. See error
 
-**Expected behavior**
+## Expected behavior
+
 A clear and concise description of what you expected to happen.
 
-**Log**
+## Log or Support bundle
-If applicable, add the Longhorn managers' log when the issue happens.
 
-You can also attach a *Support Bundle* here. You can generate a Support Bundle using the link at the footer of the Longhorn UI.
+If applicable, add the Longhorn managers' log or support bundle when the issue happens. 
+You can generate a Support Bundle using the link at the footer of the Longhorn UI.
+
+## Environment
 
-**Environment:**
  - Longhorn version:
  - Installation method (e.g. Rancher Catalog App/Helm/Kubectl):
  - Kubernetes distro (e.g. RKE/K3s/EKS/OpenShift) and version:
@@ -40,5 +44,6 @@ You can also attach a *Support Bundle* here. You can generate a Support Bundle u
  - Underlying Infrastructure (e.g. on AWS/GCE, EKS/GKE, VMWare/KVM, Baremetal):
  - Number of Longhorn volumes in the cluster:
 
-**Additional context**
+## Additional context
+
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,20 +1,24 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
-title: "[FEATURE]"
+title: "[FEATURE] "
 labels: kind/enhancement
 assignees: ''
 
 ---
 
-**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. Ex. I'm always frustrated when [...]
 
-**Describe the solution you'd like**
+## Describe the solution you'd like
-A clear and concise description of what you want to happen.
+
+A clear and concise description of what you want to happen
+
+## Describe alternatives you've considered
 
-**Describe alternatives you've considered**
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+## Additional context
+
 Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/improvement_request.md

@@ -0,0 +1,24 @@
+---
+name: Improvement request
+about: Suggest an improvement of an existing feature for this project
+title: "[IMPROVEMENT] "
+labels: kind/improvement
+assignees: ''
+
+---
+
+## Is your improvement request related to a feature? Please describe
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## 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 or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -1,14 +1,16 @@
 ---
 name: Question
 about: Question on Longhorn
-title: "[QUESTION]"
+title: "[QUESTION] "
 labels: kind/question
 assignees: ''
 
 ---
-**Question**
+## Question
+> Suggest to use https://github.com/longhorn/longhorn/discussions to ask questions.
+
+## Environment
 
-**Environment:**
  - Longhorn version:
  - Kubernetes version:
  - Node config
@@ -19,5 +21,6 @@ assignees: ''
    - Network bandwidth and latency between the nodes:
  - Underlying Infrastructure (e.g. on AWS/GCE, EKS/GKE, VMWare/KVM, Baremetal):
 
-**Additional context**
+## Additional context
+
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/task.md

@@ -1,16 +1,21 @@
 ---
 name: Task
 about: Task on Longhorn
-title: "[TASK]"
+title: "[TASK] "
 labels: kind/task
 assignees: ''
 
 ---
-**What's the task? Please describe.**
+
+## What's the task? Please describe
+
 A clear and concise description of what the task is.
 
-**Describe the items of the task (DoD, definition of done) you'd like.**
+## Describe the items of the task (DoD, definition of done) you'd like
-- [ ] <use check box for each item>
+> Please use a task list for items on a separate line with a clickable checkbox https://docs.github.com/en/issues/tracking-your-work-with-issues/about-task-lists
+
+- [ ] `item 1`
+
+## Additional context
 
-**Additional context**
 Add any other context or screenshots about the task request here.

.github/ISSUE_TEMPLATE/test.md

@@ -1,16 +1,21 @@
 ---
 name: Test
-about: Test implementation on Longhorn
+about: Test task on Longhorn
-title: "[TEST]"
+title: "[TEST] "
 labels: kind/test
 assignees: ''
 
 ---
-**What's the test to develop? Please describe.**
+
+## What's the test to develop? Please describe
+
 A clear and concise description of what the test you want to develop.
 
-**Describe the items of the test development (DoD, definition of done) you'd like.**
+## Describe the items of the test development (DoD, definition of done) you'd like
-- [ ] <use check box for each item>
+> Please use a task list for items on a separate line with a clickable checkbox https://docs.github.com/en/issues/tracking-your-work-with-issues/about-task-lists
+
+- [ ] `item 1`
+
+## Additional context
 
-**Additional context**
 Add any other context or screenshots about the test request here.