[CI-SKIP] Add newlines in templates for readability

GitHub still just dumps people into an editor. It's not quite the forms
we hoped for. Better to add newlines and hope it makes things even a
tiny bit clearer for people reporting issues.

.github/ISSUE_TEMPLATE/behavior-bug---plugin-incompatibility.md

@@ -9,6 +9,7 @@ ___What you expected to see___
 
 ### What behaviour is observed:
 ___What you actually saw___
+
 ### Steps/models to reproduce:
 ___This may include a build schematic, a video, or detailed instructions to help reconstruct the issue___
 

.github/ISSUE_TEMPLATE/performance-problem.md

@@ -15,6 +15,7 @@ ___All plugins running on the server___
 
 ### bukkit.yml, spigot.yml, paper.yml, server.properties
 ___Gist/pastebin/hastebin links___
+
 ### Other helpful links
 ___The more information we receive, the quicker and more effective we can be at finding the solution to the
 issue.___

.github/ISSUE_TEMPLATE/server-crash---stacktrace.md

@@ -7,6 +7,7 @@ about: Report server crashes and/or scary stacktraces
 ### Link/paste of stack trace
 
     You can also simply just use code formatting in markdown!
+
 ___We need all of the stack trace! Do not cut off parts of it.___
 
 ### Plugin list: