Update issue templates

Add template for registry change
Improve template for spec bug report

Author: ralfhandl

.github/ISSUE_TEMPLATE/contribute-to-the-registries-at-spec-openapis-org-registry.md

@@ -0,0 +1,25 @@
+---
+name: Contribute to the registries at spec.openapis.org/registry
+about: Add a new registry entry, or edit an existing one
+title: 'Registry: ...'
+labels: registries
+assignees: ''
+
+---
+
+**Which registry do you want to contribute to**
+- [ ] [Alternative Schema Type Registry](https://spec.openapis.org/registry/alternative-schema)
+- [ ] [Draft Features Registry](https://spec.openapis.org/registry/draft-feature)
+- [ ] [Specification Extension Registry](https://spec.openapis.org/registry/extension)
+- [ ] [Format Registry](https://spec.openapis.org/registry/format)
+- [ ] [Extension Namespace Registry](https://spec.openapis.org/registry/namespace)
+- [ ] [Tag Kind Registry](https://spec.openapis.org/registry/tag-kind)
+
+**Describe your contribution**
+A clear and concise description of what you want to add or change.
+
+**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/bug_report.md renamed to .github/ISSUE_TEMPLATE/report-an-error-in-the-specification.md

@@ -1,5 +1,5 @@
 ---
-name: Bug report
+name: Report an error in the specification
 about: Create a report to help us improve the specification
 title: 'vX.Y: ...'
 labels: ''