Add sources and javadoc download to build gradle

Author: Direwolf20-MC

build.gradle

@@ -6,6 +6,14 @@ plugins {
     id 'net.neoforged.gradle.userdev' version '7.0.165'
 }
 
+// IDEA no longer automatically downloads sources/javadoc jars for dependencies, so we need to explicitly enable the behavior.
+idea {
+    module {
+        downloadSources = true
+        downloadJavadoc = true
+    }
+}
+
 version = mod_version
 group = mod_group_id