[FIX] [ENH] Fixed issue templates. Added an issue template for documentation.

.gitlab/issue_templates/Bug.md

-Summary
+### Summary
 
 (Summarize the bug encountered concisely)
 
 
-Steps to reproduce
+### Steps to reproduce
 
 (How one can reproduce the issue - this is very important)
 
 
-What is the current bug behavior?
+### What is the current bug behavior?
 
 (What actually happens)
 
 
-What is the expected correct behavior?
+### What is the expected correct behavior?
 
 (What you should see instead)
 
 
-Relevant logs and/or screenshots
+### Relevant logs and/or screenshots
 
 (Paste any relevant logs - please use code blocks (```) to format console output,
 logs, and code as it's very hard to read otherwise.)
 
 
-Possible fixes
+### Possible fixes
 
 (If you can, link to the line of code that might be responsible for the problem)
 
-/label ~bug ~needs-investigation
+/label ~bug 
 

.gitlab/issue_templates/Todo.md → .gitlab/issue_templates/TODO.md

-Summary
+### Summary
 
 (Summarize the task concisely)
 
 
-/label ~task ~todo 
+/label ~TODO 
 

.gitlab/issue_templates/Task.md

-Summary
+### Summary
 
 (Summarize the task concisely)
 
 
-/label ~task 
+/label ~Task 
 

.gitlab/issue_templates/documentation.md

+### Summary
+
+(Summarize the task concisely)
+
+### Parts of code to be documented
+
+(Identify classes, functions etc., which should be documented)
+
+/label ~documentation 
+