Improving links (http -> https) (#425)

examples/string-functions/string-functions.go

@@ -20,7 +20,7 @@ func main() {
 	// package, not methods on the string object itself,
 	// we need pass the string in question as the first
 	// argument to the function. You can find more
-	// functions in the [`strings`](http://golang.org/pkg/strings/)
+	// functions in the [`strings`](https://pkg.go.dev/strings)
 	// package docs.
 	p("Contains:  ", s.Contains("test", "es"))
 	p("Count:     ", s.Count("test", "t"))

examples/string-functions/string-functions.hash

@@ -1,2 +1,2 @@
-e52d4023b8102ba47f3f97e67e47da1bfe393e6c
-mdta6dlNB6e
+a8fc7e03fd17f6d432adf2f0e991461630ce4350
+DSKkoyx9Rcy