Minor updates to issue templates. Instead of bold text, use headers to make sections more readable.

Author: tdonohue

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,16 +7,16 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+## Describe the bug
 A clear and concise description of what the bug is. Include the version(s) of DSpace where you've seen this problem & what *web browser* you were using. Link to examples if they are public.
 
-**To Reproduce**
+## To Reproduce
 Steps to reproduce the behavior:
 1. Do this
 2. Then this...
 
-**Expected behavior**
+## Expected behavior
 A clear and concise description of what you expected to happen.
 
-**Related work**
+## Related work
 Link to any related tickets or PRs here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,14 @@ assignees: ''
 
 ---
 
-**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 [...]
+## Is your feature request related to a problem? Please describe.
+A clear and concise description of what the problem or use case is. For example, 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.
 
-**Describe alternatives or workarounds you've considered**
+## Describe alternatives or workarounds 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.
+## Additional information
+Add any other information, related tickets or screenshots about the feature request here.