[skip ci] Updated swagger docs

pkg/swagger/swagger.json

@@ -1281,6 +1281,32 @@
                         }
                     }
                 }
+            },
+            "post": {
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "sharing"
+                ],
+                "summary": "Mark all notifications of a user as read",
+                "responses": {
+                    "200": {
+                        "description": "All notifications marked as read.",
+                        "schema": {
+                            "$ref": "#/definitions/models.Message"
+                        }
+                    },
+                    "500": {
+                        "description": "Internal error",
+                        "schema": {
+                            "$ref": "#/definitions/models.Message"
+                        }
+                    }
+                }
             }
         },
         "/notifications/{id}": {