Attaches the specified managed policy to the specified user.
You use this API to attach a managed policy to a user. To embed an inline policy in a user, use PutUserPolicy.
For more information about policies, see Managed Policies and Inline Policies in the IAM User Guide.
/// The request was rejected because an invalid or out-of-range value was supplied for
/// an input parameter.
///
/// The request was rejected because it attempted to create resources beyond the current
/// AWS account limits. The error message describes the limit exceeded.
///
/// The request was rejected because it referenced an entity that does not exist. The
/// error message describes the entity.
///
/// The request processing has failed because of an unknown error, exception or failure.
///
