Attaches the specified managed policy to the specified IAM role.
When you attach a managed policy to a role, the managed policy becomes part of the role's permission (access) policy. You cannot use a managed policy as the role's trust policy. The role's trust policy is created at the same time as the role, using CreateRole. You can update a role's trust policy using UpdateAssumeRolePolicy.
Use this API to attach a managed policy to a role. To embed an inline policy in a role, use PutRolePolicy. 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.
///
