Fixes default timeout documentation comment (#317)

Motivation:
Right now documentation states that timrout defaults to no timeout, this
is no actually true, if timeout is not set NIO bootstrap defaults to 10
seconds connect timeout.

Modifications:
Updates documentation comment.

Result:
Closes #118

Sources/AsyncHTTPClient/HTTPClient.swift

@@ -639,7 +639,7 @@ public class HTTPClient {
  /// - `307: Temporary Redirect`
  /// - `308: Permanent Redirect`
  public var redirectConfiguration: RedirectConfiguration
- /// Default client timeout, defaults to no timeouts.
+ /// Default client timeout, defaults to no `read` timeout and 10 seconds `connect` timeout.
  public var timeout: Timeout
  /// Connection pool configuration.
  public var connectionPool: ConnectionPool