refact: update doc of UserServiceProtocol

Author: makinosp

Sources/VRCKit/Protocols/UserServiceProtocol.swift

@@ -6,6 +6,16 @@
 //
 
 public protocol UserServiceProtocol: Sendable {
+    /// Fetches detailed information about a specific user.
+    /// - Parameter userId: The ID of the user to retrieve.
+    /// - Returns: A `UserDetail` object containing detailed information about the specified user.
+    /// - Throws: An error if the request fails or decoding is unsuccessful.
     func fetchUser(userId: String) async throws -> UserDetail
+
+    /// Updates the information for a specific user.
+    /// - Parameters:
+    ///   - id: The ID of the user to update.
+    ///   - editedInfo: An `EditableUserInfo` object containing the updated user information.
+    /// - Throws: An error if the request fails or encoding is unsuccessful.
     func updateUser(id: String, editedInfo: EditableUserInfo) async throws
 }

Sources/VRCKit/Services/UserService.swift

@@ -12,13 +12,11 @@ public final actor UserService: APIService, UserServiceProtocol {
     public let client: APIClient
     private let path = "users"
 
-    /// Fetch a user
     public func fetchUser(userId: String) async throws -> UserDetail {
         let response = try await client.request(path: "\(path)/\(userId)", method: .get)
         return try Serializer.shared.decode(response.data)
     }
 
-    /// Update user
     public func updateUser(id: String, editedInfo: EditableUserInfo) async throws {
         let requestData = try Serializer.shared.encode(editedInfo)
         _ = try await client.request(