Fix AstPrinter to print field descriptions

src/main/java/graphql/language/AstPrinter.java

@@ -163,7 +163,7 @@ private NodePrinter<FieldDefinition> fieldDefinition() {
         final String argSep = compactMode ? "," : ", ";
         return (out, node) -> {
             String args;
-            if (hasDescription(node.getInputValueDefinitions()) && !compactMode) {
+            if (hasDescription(Collections.singletonList(node)) && !compactMode) {
                 out.append(description(node));
                 args = join(node.getInputValueDefinitions(), "\n");
                 out.append(node.getName())

src/test/groovy/graphql/language/AstPrinterTest.groovy

@@ -472,6 +472,22 @@ type Query {
 
     }
 
+    def "print field descriptions"() {
+        def query = '''type Query {
+  "comment"
+  field: String
+}
+'''
+        def document = parse(query)
+        String output = printAst(document)
+        expect:
+        output == '''type Query {
+  "comment"
+  field: String
+}
+'''
+    }
+
     def "print empty description"() {
         def query = '''
 ""