Remove outdated metaspace workaround for Asciidoctor/JRuby

Original workaround was introduced by
00f5e85,
but later obsoleted by
52497df

Author: TWiStErRob

documentation/documentation.gradle.kts

@@ -363,7 +363,9 @@ tasks {
 	}
 
 	asciidoctorPdf {
-		setExecutionMode(JAVA_EXEC) // Avoid classpath conflicts with other Gradle plugins (e.g. JReleaser)
+		// Avoid classpath conflicts with other Gradle plugins (e.g. JReleaser)
+		// Avoid propagating apparent memory leaks in Asciidoctor/JRuby to Gradle daemon.
+		setExecutionMode(JAVA_EXEC)
 		jvm {
 			maxHeapSize = "512M"
 		}

gradle.properties

@@ -3,8 +3,7 @@ version = 6.1.0-SNAPSHOT
 # For backward compatibility checks
 apiBaselineVersion = 6.0.1
 
-# We need more metaspace due to apparent memory leak in Asciidoctor/JRuby
-org.gradle.jvmargs=-Xmx1g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError
+org.gradle.jvmargs=-Xmx1g -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.caching=true
 org.gradle.parallel=true
 org.gradle.configuration-cache.parallel=true