update examples and add documentation

07-type-mapping/main.ts

@@ -22,7 +22,7 @@ type OpArgsMapping = {
 };
 
 class WebSocketClient {
-  public op<TOp extends OpCode, TArgs extends OpArgsMapping[TOp]>(
+  public send<TOp extends OpCode, TArgs extends OpArgsMapping[TOp]>(
     op: TOp,
     args: TArgs,
   ) {
@@ -32,5 +32,5 @@ class WebSocketClient {
 
 function main_ws() {
   const client = new WebSocketClient();
-  client.op(OpCode.PING, {});
+  client.send(OpCode.PING, {});
 }