docs: fix missing LcFirst example call, readme

README.md

@@ -166,7 +166,7 @@ println(v)
 LcFirst returns the string with the first rune lower-cased.
 
 ```go
-v := str.Of("Gopher")
+v := str.Of("Gopher").LcFirst().String()
 fmt.Println(v)
 // #string gopher
 ```

examples/lcfirst/main.go

@@ -12,7 +12,7 @@ func main() {
 	// LcFirst returns the string with the first rune lower-cased.
 
 	// Example: lowercase first rune
-	v := str.Of("Gopher")
+	v := str.Of("Gopher").LcFirst().String()
 	fmt.Println(v)
 	// #string gopher
 }

lcfirst.go

@@ -7,7 +7,7 @@ import "unicode"
 //
 // Example: lowercase first rune
 //
-//	v := str.Of("Gopher")
+//	v := str.Of("Gopher").LcFirst().String()
 //	fmt.Println(v)
 //	// #string gopher
 func (s String) LcFirst() String {