fix MDX comment syntax in templates

Author: Simek

website/contributing/_markdown-GH-release-notes-prerelease.mdx

@@ -1,11 +1,11 @@
 ```markdown
-- {/_ TODO List out notable picks for this patch _/}
+- {/* TODO List out notable picks for this patch */}
 
 ---
 
 To test it, run:
 
-{/_ TODO Update with your version _/}
+{/* TODO Update with your version */}
 
 npx react-native init RN069RC0 --version 0.69.0-rc.0
 
@@ -21,7 +21,7 @@ npx react-native init RN069RC0 --version 0.69.0-rc.0
 
 ### Help us testing 🧪
 
-{/_ TODO Add the call to action for something specific that we want folks to test _/}
+{/* TODO Add the call to action for something specific that we want folks to test */}
 
 Let us know how it went by posting a comment in the [working group discussion](https://github.com/reactwg/react-native-releases/discussions)! Please specify with system you tried it on (ex. macos, windows).
 

website/contributing/_markdown-road-to-release-template.mdx

@@ -1,11 +1,11 @@
 ```markdown
-{/_ Title: Road to <YOUR_VERSION> _/}
+{/* Title: Road to <YOUR_VERSION> */}
 
 The branch cut has happened.
 
 ## Notice
 
-{/_ TODO update the version _/}
+{/* TODO update the version */}
 
 - [Current release candidate: 0.69.0-rc.0][current-release]
 - Have an issue with current release candidate? [File an issue][issue-form] and we will triage.
@@ -14,7 +14,7 @@ The branch cut has happened.
 
 #### Highlighted Changes in this release
 
-{/_ Add stand-out changes in this release, and link to changelog PR. _/}
+{/* Add stand-out changes in this release, and link to changelog PR. */}
 
 - Checkout this [Changelog PR][changelog-pr]
 
@@ -33,7 +33,7 @@ The branch cut has happened.
 
 #### Retrospective Topics
 
-{/_ List out pain points, issues to investigate that are not release-blocking to follow up on _/}
+{/* List out pain points, issues to investigate that are not release-blocking to follow up on */}
 
 -