Update amendment-proposal.yml

fixing indentation

.github/ISSUE_TEMPLATE/amendment-proposal.yml

@@ -5,7 +5,7 @@ body:
   - type: markdown
     attributes:
       value: The content in this issue, excluding the initial request, will be kept up to date during the drafting of the proposal. Please pay attention to accuracy, spelling and grammar as it may be referenced in an official document for WMO adoption. 
- - type: textarea
+  - type: textarea
     id: introduction
     attributes:
       label: Introduction
@@ -70,4 +70,4 @@ body:
     attributes:
       label: References
       description: Other publications, websites or resources that were reviewed during the drafting of the proposal.
-      placeholder: Enter references reviewed. 
+      placeholder: Enter references reviewed.