Revert "[remkop#1308] DOC: Add example for Option converter."

This reverts commit afec872.

docs/index.adoc

@@ -1133,44 +1133,31 @@ public interface ITypeConverter<K> {
 }
 ----
 
-For example:
+Custom type converters can be registered with the `CommandLine.registerConverter(Class<K> cls, ITypeConverter<K> converter)` method. All options and positional parameters with the specified type will be converted by the specified converter.
 
-[source,java]
-----
-import javax.crypto.Cipher;
 
-class CipherConverter implements ITypeConverter<Cipher> {
-    public Cipher convert(String value) throws Exception {
-        return Cipher.getInstance(value);
-    }
-}
-----
-
-Custom type converters can be specified for a specific option or positional parameter with the `converter` annotation attribute.
-This is described in more detail in the <<Option-specific Type Converters>> section, but here is a quick example:
+NOTE: Java 8 lambdas make it easy to register custom converters:
 
 .Java
 [source,java,role="primary"]
 ----
-class App {
-    @Option(names = "-a", converter = CipherConverter.class)
-    javax.crypto.Cipher cipher;
-}
+CommandLine cl = new CommandLine(app);
+cl.registerConverter(Locale.class, s -> new Locale.Builder().setLanguageTag(s).build());
+cl.registerConverter(Cipher.class, s -> Cipher.getInstance(s));
 ----
 
 .Kotlin
-[source,kotlin,role="secondary"]
+[source,java,role="secondary"]
 ----
-class App {
-    @Option(names = ["-a"], converter = [CipherConverter::class])
-    lateinit var cipher: javax.crypto.Cipher
+val cl = CommandLine(app)
+cl.registerConverter(Locale::class.java) {
+    s: String? -> Locale.Builder().setLanguageTag(s).build()
+}
+cl.registerConverter(Cipher::class.java) {
+    Cipher.getInstance(it)
 }
 ----
 
-
-Alternatively, custom type converters can be registered _per type_ in each command with the `CommandLine.registerConverter(Class<K> cls, ITypeConverter<K> converter)` method.
-All options and positional parameters with the specified type will be converted by the specified converter.
-
 After registering custom converters, call the `execute(String...)` or `parseArgs(String...)` method on the `CommandLine` instance where the converters are registered. (The static `populateCommand` method cannot be used.) For example:
 
 .Java
@@ -1198,8 +1185,6 @@ class App {
 }
 ----
 
-NOTE: Java 8 lambdas make it easy to register custom converters:
-
 .Java
 [source,kotlin,role="primary"]
 ----