Update godoc for client package

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

container.go

@@ -17,17 +17,31 @@ import (
 	"github.com/pkg/errors"
 )
 
+// DeleteOpts allows the caller to set options for the deletion of a container
 type DeleteOpts func(context.Context, *Client, containers.Container) error
 
+// Container is a metadata object for container resources and task creation
 type Container interface {
+	// ID identifies the container
 	ID() string
+	// Info returns the underlying container record type
 	Info() containers.Container
+	// Delete removes the container
 	Delete(context.Context, ...DeleteOpts) error
+	// NewTask creates a new task based on the container metadata
 	NewTask(context.Context, IOCreation, ...NewTaskOpts) (Task, error)
+	// Spec returns the OCI runtime specification
 	Spec() (*specs.Spec, error)
+	// Task returns the current task for the container
+	//
+	// If IOAttach options are passed the client will reattach to the IO for the running
+	// task. If no task exists for the container a NotFound error is returned
 	Task(context.Context, IOAttach) (Task, error)
+	// Image returns the image that the container is based on
 	Image(context.Context) (Image, error)
+	// Labels returns the labels set on the container
 	Labels(context.Context) (map[string]string, error)
+	// SetLabels sets the provided labels for the container and returns the final label set
 	SetLabels(context.Context, map[string]string) (map[string]string, error)
 }
 
@@ -153,8 +167,10 @@ func (c *container) Image(ctx context.Context) (Image, error) {
 	}, nil
 }
 
+// NewTaskOpts allows the caller to set options on a new task
 type NewTaskOpts func(context.Context, *Client, *TaskInfo) error
 
+// WithRootFS allows a task to be created without a snapshot being allocated to its container
 func WithRootFS(mounts []mount.Mount) NewTaskOpts {
 	return func(ctx context.Context, c *Client, ti *TaskInfo) error {
 		ti.RootFS = mounts