docs: Fix copy-paste-error on Join/Leave docs for Bot messages

Signed-off-by: Joas Schilling <coding@schilljs.com>

docs/bots.md

@@ -109,7 +109,7 @@ The content format follows the [Activity Streams 2.0 Vocabulary](https://www.w3.
  "id": "bots/bot-a78f46c5c203141b247554e180e1aa3553d282c6",
  "name": "Bot123"
  },
- "target": {
+ "object": {
  "type": "Collection",
  "id": "n3xtc10ud",
  "name": "world"
@@ -123,8 +123,8 @@ The content format follows the [Activity Streams 2.0 Vocabulary](https://www.w3.
 |------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | actor.id | Bot's [actor type](constants.md#actor-types-of-chat-messages) followed by the `/` slash character and a bot's unique sha1 identifier with `bot-` prefix. |
 | actor.name | The display name of the bot. |
-| target.id | The token of the conversation in which the bot was added. |
-| target.name | The name of the conversation in which the bot was added. |
+| object.id | The token of the conversation in which the bot was added. |
+| object.name | The name of the conversation in which the bot was added. |
 
 ## Bot removed from a chat
 
@@ -152,7 +152,7 @@ The content format follows the [Activity Streams 2.0 Vocabulary](https://www.w3.
  "id": "bots/bot-a78f46c5c203141b247554e180e1aa3553d282c6",
  "name": "Bot123"
  },
- "target": {
+ "object": {
  "type": "Collection",
  "id": "n3xtc10ud",
  "name": "world"
@@ -166,8 +166,8 @@ The content format follows the [Activity Streams 2.0 Vocabulary](https://www.w3.
 |------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | actor.id | Bot's [actor type](constants.md#actor-types-of-chat-messages) followed by the `/` slash character and a bot's unique sha1 identifier with `bot-` prefix. |
 | actor.name | The display name of the bot. |
-| target.id | The token of the conversation from which the bot was removed. |
-| target.name | The name of the conversation from which the bot was removed. |
+| object.id | The token of the conversation from which the bot was removed. |
+| object.name | The name of the conversation from which the bot was removed. |
 
 ## Sending a chat message