Add warning in issue template to create a discussion first

Author: Kate Osborn

.github/ISSUE_TEMPLATE/enhancement.md

@@ -1,11 +1,13 @@
 ---
-name: Enhancement Request 
-about: Suggest an idea for this project 
-title: ''
-labels: 'proposal' 
-assignees: ''
+name: Enhancement Request about: Suggest an idea for this project title: ''
+labels: 'proposal' assignees: ''
 ---
 
+<!--
+WARNING: Prior to submitting an enhancement request, we ask that you create a discussion. If you have not yet 
+created a discussion related to your request, please do so now: https://github.com/nginxinc/nginx-kubernetes-gateway/discussions/new?category=ideas
+-->
+
 **Is your enhancement request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 

ISSUE_LIFECYCLE.md

@@ -20,9 +20,9 @@ lifecycle.)
 
    `bug`: The implementation of a feature is not correct.
 
-   `proposal`:  An enhancement, tackling technical debt, documentation changes, or improving existing features. In cases
+   `enhancement`:  An enhancement, tackling technical debt, documentation changes, or improving existing features. In cases
    where the enhancement requires an [Enhancement Proposal](/docs/proposals/README.md), the additional
-   label `needs-enhancement-proposal` will be added.
+   label `enhancement-proposal` will be added.
 
    `question`: The owner converts the issue to a github discussion and engages the creator.
 

docs/proposals/README.md

@@ -49,7 +49,7 @@ If there is consensus on the discussion post that the enhancement is important a
 maintainer will ask you to [open an issue][issue] on GitHub.
 
 Not every enhancement warrants an Enhancement Proposal. _If_ the enhancement issue requires an Enhancement Proposals,
-the maintainers will add the label `needs-enhancement-proposal` to the issue.
+the maintainers will add the label `enhancement-proposal` to the issue.
 
 [issue]: https://github.com/nginxinc/nginx-kubernetes-gateway/issues/new?assignees=&labels=proposal&projects=&template=enhancement.md&title=