chore: add missing docstrings

Author: kelvin-olaiya

src/main/kotlin/io/github/kelvindev15/kotlin2plantuml/utils/DefaultScanConfiguration.kt

@@ -8,6 +8,9 @@ import kotlin.io.path.Path
  * A default implementation of [ScanConfiguration].
  */
 class DefaultScanConfiguration private constructor() {
+    /**
+     * Static methods.
+     */
     companion object : ScanConfiguration {
         private val packages = mutableListOf<String>()
         private val classpath = mutableListOf<URL>()

src/main/kotlin/io/github/kelvindev15/kotlin2plantuml/utils/ReflectUtils.kt

@@ -16,6 +16,9 @@ import kotlin.reflect.jvm.jvmErasure
  * PlantUML utilities.
  */
 class ReflectUtils private constructor() {
+    /**
+     * Utility functions for reflection.
+     */
     companion object {
         private fun loadClassOrNull(fullyQualifiedClass: String): KClass<*>? {
             var result: KClass<*>? = null