Fix spotless configuration

Author: jprinet

gradle/plugins/common/src/main/kotlin/junitbuild.spotless-conventions.gradle.kts

@@ -20,6 +20,7 @@ spotless {
 
 	format("documentation") {
 		target("*.adoc", "*.md", "src/**/*.adoc", "src/**/*.md")
+		targetExclude("**/build", "**/target")
 		trimTrailingWhitespace()
 		endWithNewline()
 	}