Revert documentation for unfinished feature

Using-the-API/API.md

@@ -165,13 +165,6 @@ Returns the target account's [Relationship](#relationship).
 
 Returns the target account's [Relationship](#relationship).
 
-#### Muting/unmuting an account's boosts:
-
-    POST /api/v1/accounts/:id/mute_boosts
-    POST /api/v1/accounts/:id/unmute_boosts
-
-Returns the target account's [Relationship](#relationship).
-
 #### Getting an account's relationships:
 
     GET /api/v1/accounts/relationships
@@ -682,7 +675,6 @@ Note: Some attributes in the entity payload can have ``null`` value and are mark
 | `followed_by`            | Whether the user is currently being followed by the account  | no       |
 | `blocking`               | Whether the user is currently blocking the account           | no       |
 | `muting`                 | Whether the user is currently muting the account             | no       |
-| `muting_boosts`          | Whether the user is currently muting boosts from the account | no       |
 | `requested`              | Whether the user has requested to follow the account         | no       |
 | `domain_blocking`        | Whether the user is currently blocking the user's domain     | no       |