doc: update docs.

Signed-off-by: Chen Su <ghosind@gmail.com>

Author: ghosind

forever.go

@@ -13,7 +13,7 @@ type ForeverFn func(ctx context.Context, next func(context.Context)) error
 // You can use the context and call the next function to pass values to the next invocation. The
 // next function can be invoked one time only, and it will have no effect if it is invoked again.
 //
-//	err := Forever(func(ctx context.Context, next func(context.Context)) error {
+//	err := async.Forever(func(ctx context.Context, next func(context.Context)) error {
 //	  v := ctx.Value("key")
 //	  if v != nil {
 //	    vi := v.(int)

parallel.go

@@ -12,7 +12,7 @@ import (
 // limitation if the number is 0.
 //
 //	// Run 2 functions asynchronously at the time.
-//	out, err := Parallel(2, func(ctx context.Context) (int, error) {
+//	out, err := async.Parallel(2, func(ctx context.Context) (int, error) {
 //	  // Do something
 //	  return 1, nil
 //	}, func(ctx context.Context) (string, error) {

race.go

@@ -9,7 +9,7 @@ import (
 // of the finished function (including panic), and it will not send a cancel signal to other
 // functions.
 //
-//	out, index, err := Race(func(ctx context.Context) (int, error) {
+//	out, index, err := async.Race(func(ctx context.Context) (int, error) {
 //	  request.Get("https://example.com")
 //	  return 0, nil
 //	}, func(ctx context.Context) (string, error) {

retry.go

@@ -29,12 +29,12 @@ type RetryOptions struct {
 // the successful task. If all attempts fail, it will return the result and the error of the final
 // attempt.
 //
-//	Retry(func() error {
+//	async.Retry(func() error {
 //	  // Do something
 //	  return err
 //	}) // Run the function 5 times without interval time or it succeed
 //
-//	Retry(func() error {
+//	async.Retry(func() error {
 //	  // Do something
 //	  return err
 //	}, RetryOptions{

seq.go

@@ -9,7 +9,7 @@ import (
 // function. It returns the result of the last function, or it terminates and returns the error
 // that panics or returns by the function in the list.
 //
-//	out, err :=Seq(func () int {
+//	out, err := async.Seq(func () int {
 //		return 1
 //	}, func (n int) int {
 //		return n + 1
@@ -20,9 +20,10 @@ func Seq(funcs ...AsyncFn) ([]any, error) {
 	return seq(context.Background(), funcs...)
 }
 
-// Seq runs the functions in order with the specified context, and each function consumes the
-// returns value of the previous function. It returns the result of the last function, or it
-// terminates and returns the error that panics or returns by the function in the list.
+// SeqWithContext runs the functions in order with the specified context, and each function
+// consumes the returns value of the previous function. It returns the result of the last
+// function, or it terminates and returns the error that panics or returns by the function in the
+// list.
 func SeqWithContext(ctx context.Context, funcs ...AsyncFn) ([]any, error) {
 	return seq(ctx, funcs...)
 }
@@ -75,15 +76,27 @@ func validateSeqFuncs(funcs ...AsyncFn) error {
 	return nil
 }
 
-// SeGroups runs the functions group in order, and it will be terminated if any function returns error.
+// SeGroups runs the functions group in order, and it will be terminated if any function returns
+// error.
+//
+//	err := async.SeqGroups([]async.AsyncFn{func () {
+//			// fn 1.a
+//		}, func () {
+//			// fn 1.b
+//		}}, []async.AsyncFn{func() {
+//			// fn 2
+//		}})
 func SeqGroups(groups ...[]AsyncFn) error {
 	return seqGroups(context.Background(), groups...)
 }
 
+// SeqGroupsWithContext runs the functions group in order with the specified context, and it will
+// be terminated if any function returns error.
 func SeqGroupsWithContext(ctx context.Context, groups ...[]AsyncFn) error {
 	return seqGroups(ctx, groups...)
 }
 
+// seqGroups runs the functions group in order.
 func seqGroups(ctx context.Context, groups ...[]AsyncFn) error {
 	if len(groups) == 0 {
 		return nil

series.go

@@ -8,7 +8,7 @@ import (
 // Each one runs once the previous function has been completed. If any function panics or returns
 // an error, no more functions are run and it will return immediately.
 //
-//	Series(func () {
+//	async.Series(func () {
 //		// do first thing
 //	}, func () {
 //		// do second thing
@@ -25,6 +25,7 @@ func SeriesWithContext(ctx context.Context, funcs ...AsyncFn) ([][]any, error) {
 	return series(ctx, funcs...)
 }
 
+// series runs the functions by the order.
 func series(ctx context.Context, funcs ...AsyncFn) ([][]any, error) {
 	validateAsyncFuncs(funcs...)
 

until.go

@@ -15,7 +15,7 @@ import (
 // values' types of the execution function.
 //
 //	c := 0
-//	Until(func() bool {
+//	async.Until(func() bool {
 //	  return c == 5
 //	}, func() {
 //	  c++

while.go

@@ -12,7 +12,7 @@ import (
 // - It should have no parameters or accept a context only.
 //
 //	c := 0
-//	While(func() bool {
+//	async.While(func() bool {
 //	  return c == 5
 //	}, func() {
 //	  c++