clarify comment

Author: simschla

lib/build.gradle

@@ -81,7 +81,7 @@ dependencies {
 
 	palantirJavaFormatCompileOnly 'com.palantir.javaformat:palantir-java-format:1.1.0' 	// this version needs to stay compilable against Java 8 for CI Job testNpm
 
-	googleJavaFormatCompileOnly 'com.google.googlejavaformat:google-java-format:1.8' // minimum required version for jdk 11
+	googleJavaFormatCompileOnly 'com.google.googlejavaformat:google-java-format:1.8' // minimum required version due to api changes before then
 	testGoogleJavaFormatImplementation "com.diffplug.durian:durian-core:$VER_DURIAN"
 
 	// used jackson-based formatters