Update docs

Signed-off-by: Vitor Mattos <vitor@php.rio>

docs/reaction.md

@@ -21,6 +21,16 @@ Base endpoint is: `/ocs/v2.php/apps/spreed/api/v1`
         + `404 Not Found` When the conversation or message to react could not be found for the participant
         + `409 Conflict` User already did this reaction to this message
 
+    - Data:
+        Array with data of reactions:
+
+        field | type | Description
+        ---|---|---
+        `actorType` | string | `guests` or `users`
+        `actorId` | string | Actor id of the reacting participant
+        `actorDisplayName` | string | Display name of the reaction author
+        `timestamp` | int | Timestamp in seconds and UTC time zone
+
 ## Delete a reaction
 
 * Required capability: `reactions`
@@ -38,6 +48,16 @@ Base endpoint is: `/ocs/v2.php/apps/spreed/api/v1`
         + `400 Bad Request` In case of no reaction support, message out of reactions context or any other error
         + `404 Not Found` When the conversation or message to react or reaction could not be found for the participant
 
+    - Data:
+        Array with data of reactions:
+
+        field | type | Description
+        ---|---|---
+        `actorType` | string | `guests` or `users`
+        `actorId` | string | Actor id of the reacting participant
+        `actorDisplayName` | string | Display name of the reaction author
+        `timestamp` | int | Timestamp in seconds and UTC time zone
+
 ## Retrieve reactions of a message by type
 
 * Required capability: `reactions`