Merge pull request #325 from ably/chat-add-message-reactions-delete-CHA-1005

Add chat message reaction delete spec point and rename add->send

Author: vladvelici

src/chat-features.md

@@ -942,13 +942,13 @@ property inside the `Messages` obejct. From the `Room` level:
 
 <!-- -->
 
-- `(CHA-MR4)` `[Testable]` Users should be able to send a reaction via
-  the \`add\` method of the \`MessagesReactions\` object
-  (`room.messages.reactions.add`).
-  - `(CHA-MR4a)` `[Testable]` The \`add\` method accepts a message (or
+- `(CHA-MR4)` `[Testable]` Users should be able to send a reaction to a
+  message via the \`send\` method of the \`MessagesReactions\` object
+  (`room.messages.reactions.send`).
+  - `(CHA-MR4a)` `[Testable]` The \`send\` method accepts a message (or
     message serial) as the first parameter to identify which message to
     react to.
-  - `(CHA-MR4b)` `[Testable]` The \`add\` method accepts a \`params\`
+  - `(CHA-MR4b)` `[Testable]` The \`send\` method accepts a \`params\`
     object as the second parameter with the following properties:
     - `(CHA-MR4b1)` `[Testable]` A \`name\` property (required)
       specifying the reaction identifier (e.g., emoji string).
@@ -961,6 +961,24 @@ property inside the `Messages` obejct. From the `Room` level:
 
 <!-- -->
 
+- `(CHA-MR11)` `[Testable]` Users should be able to delete a reaction
+  from a message via the \`delete\` method of the \`MessagesReactions\`
+  object (`room.messages.reactions.delete`).
+  - `(CHA-MR11a)` `[Testable]` The \`delete\` method accepts a message
+    (or message serial) as the first parameter to identify which message
+    to delete the reaction from.
+  - `(CHA-MR11b)` `[Testable]` The \`delete\` method accepts a
+    \`params\` object as the second parameter with the following
+    properties:
+    - `(CHA-MR11b1)` `[Testable]` A \`name\` property specifying the
+      reaction identifier (e.g., emoji string). It is required for all
+      reaction types except for `Unique`.
+    - `(CHA-MR11b2)` `[Testable]` A \`type\` property (optional)
+      specifying the reaction type. If not provided, the default
+      reaction type for the room is used.
+
+<!-- -->
+
 - `(CHA-MR5)` `[Testable]` Users may configure a default message
   reactions type for a room. This configuration is provided at the
   `RoomOptions.messages.defaultMessageReactionType` property, or