📝 Simpilify the structure of API references.

docs/api/ipc-renderer.md

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+# ipc (renderer)
+
+The `ipc` module provides a few methods so you can send synchronous and
+asynchronous messages to the browser, and also receive messages sent from
+browser. If you want to make use of modules of browser from renderer, you
+might consider using the [remote](remote.md) module.
+
+See [ipc (browser)](ipc-browser.md) for examples.
+
+## ipc.send(channel[, args...])
+
+Send `args..` to the web page via `channel` in asynchronous message, the browser
+process can handle it by listening to the `channel` event of `ipc` module.
+
+## ipc.sendSync(channel[, args...])
+
+Send `args..` to the web page via `channel` in synchronous message, and returns
+the result sent from browser. The browser process can handle it by listening to
+the `channel` event of `ipc` module, and returns by setting `event.returnValue`.
+
+**Note:** Usually developers should never use this API, since sending
+synchronous message would block the whole web page.