GitHub: add platformBundledModules property placeholder to cleanup gradle.properties

Author: hsz

.github/template-cleanup/gradle.properties

@@ -18,6 +18,8 @@ platformVersion = 2024.3.6
 platformPlugins =
 # Example: platformBundledPlugins = com.intellij.java
 platformBundledPlugins =
+# Example: platformBundledModules = intellij.spellchecker
+platformBundledModules =
 
 # Gradle Releases -> https://github.com/gradle/gradle/releases
 gradleVersion = 9.0.0