chore: deprecate `senderId` and `senderIsMainFrame` (#39381)

docs/api/structures/ipc-renderer-event.md

@@ -1,8 +1,8 @@
 # IpcRendererEvent Object extends `Event`
 
 * `sender` [IpcRenderer](../ipc-renderer.md) - The `IpcRenderer` instance that emitted the event originally
-* `senderId` Integer - The `webContents.id` that sent the message, you can call `event.sender.sendTo(event.senderId, ...)` to reply to the message, see [ipcRenderer.sendTo][ipc-renderer-sendto] for more information. This only applies to messages sent from a different renderer. Messages sent directly from the main process set `event.senderId` to `0`.
-* `senderIsMainFrame` boolean (optional) - Whether the message sent via [ipcRenderer.sendTo][ipc-renderer-sendto] was sent by the main frame. This is relevant when `nodeIntegrationInSubFrames` is enabled in the originating `webContents`.
+* `senderId` Integer _Deprecated_ - The `webContents.id` that sent the message, you can call `event.sender.sendTo(event.senderId, ...)` to reply to the message, see [ipcRenderer.sendTo][ipc-renderer-sendto] for more information. This only applies to messages sent from a different renderer. Messages sent directly from the main process set `event.senderId` to `0`.
+* `senderIsMainFrame` boolean (optional) _Deprecated_ - Whether the message sent via [ipcRenderer.sendTo][ipc-renderer-sendto] was sent by the main frame. This is relevant when `nodeIntegrationInSubFrames` is enabled in the originating `webContents`.
 * `ports` [MessagePort][][] - A list of MessagePorts that were transferred with this message
 
 [ipc-renderer-sendto]: ../ipc-renderer.md#ipcrenderersendtowebcontentsid-channel-args-deprecated

docs/breaking-changes.md

@@ -25,6 +25,8 @@ or later will be required to run Electron v27.0.0 and higher.
 
 The `ipcRenderer.sendTo()` API has been deprecated. It should be replaced by setting up a [`MessageChannel`](tutorial/message-ports.md#setting-up-a-messagechannel-between-two-renderers) between the renderers.
 
+The `senderId` and `senderIsMainFrame` properties of `IpcRendererEvent` have been deprecated as well.
+
 ## Planned Breaking API Changes (25.0)
 
 ### Deprecated: `protocol.{register,intercept}{Buffer,String,Stream,File,Http}Protocol`