gradle-plugin: Imporve GRADLE_PLUGIN.md
gradle-plugin: Imporve GRADLE_PLUGIN.md

JetBrains/kotlin-native,JuliusKunze/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,jiaminglu/kotlin-native,jiaminglu/kotlin-native,JuliusKunze/kotlin-native,wiltonlazary/kotlin-native,JuliusKunze/kotlin-native,wiltonlazary/kotlin-native,JetBrains/kotlin-native,jiaminglu/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,jiaminglu/kotlin-native,jiaminglu/kotlin-native,wiltonlazary/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,jiaminglu/kotlin-native,jiaminglu/kotlin-native,JuliusKunze/kotlin-native,jiaminglu/kotlin-native,JetBrains/kotlin-native,JetBrains/kotlin-native