docs: update README example to use slices.IsSorted and slices.Sort

[mi-wada]

slices.IsSorted is a modern alternative to sort.StringsAreSorted:

$ go doc sort.StringsAreSorted
package sort // import "sort"

func StringsAreSorted(x []string) bool
    StringsAreSorted reports whether the slice x is sorted in increasing order.

    Note: as of Go 1.22, this function simply calls slices.IsSorted.

slices.Sort:

$ go doc sort.Strings
package sort // import "sort"

func Strings(x []string)
    Strings sorts a slice of strings in increasing order.

    Note: as of Go 1.22, this function simply calls slices.Sort.

[Copilot]

Pull request overview

This pull request updates the README example to use the modern slices.IsSorted function instead of the deprecated sort.StringsAreSorted function, following Go 1.22+ best practices.

Changes:

• Updated the example code to replace sort.StringsAreSorted(s) with slices.IsSorted(s)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.