Change H2 to H3

Author: sdwheeler

powershell-gallery/docs-conceptual/powershellget/psresourceget-release-notes.md

@@ -87,7 +87,7 @@ Bug fixes
 - Added pipeline by property name support for **Name** and **Repository** parameters for
   `Find-PSResource`
 
-## 1.0.0 - 2023-10-09
+### 1.0.0 - 2023-10-09
 
 - Add `ApiVersion` parameter for `Register-PSResourceRepository`
 - Automatically set the ApiVersion to v2 for repositories imported from PowerShellGet