Merge pull request #13719 from jdaugherty/6.2.x

Pull forward #12494 fix into 6.2.x that was missed in 5.x

Author: jdaugherty

grails-docs/src/main/groovy/grails/doc/gradle/PublishGuide.groovy

@@ -34,7 +34,7 @@ class PublishGuide extends DefaultTask {
     @Optional @InputDirectory File workDir = project.layout.buildDirectory.get().asFile
     @Optional @InputDirectory File resourcesDir = new File(project.projectDir, "resources")
 
-    @Nested Collection macros = []
+    @Optional Collection macros = []
 
     @OutputDirectory File targetDir = project.layout.buildDirectory.dir("docs").get().asFile