fix speciality to specialty

en/02.4.md

@@ -105,7 +105,7 @@ Let's see one example.
 
 	type Student struct {
     	Human  // embedded field, it means Student struct includes all fields that Human has.
-    	speciality string
+    	specialty string
 	}
 
 	func main() {
@@ -116,11 +116,11 @@ Let's see one example.
     	fmt.Println("His name is ", mark.name)
     	fmt.Println("His age is ", mark.age)
     	fmt.Println("His weight is ", mark.weight)
-    	fmt.Println("His speciality is ", mark.speciality)
+    	fmt.Println("His specialty is ", mark.specialty)
     	// modify notes
-    	mark.speciality = "AI"
-    	fmt.Println("Mark changed his speciality")
-    	fmt.Println("His speciality is ", mark.speciality)
+    	mark.specialty = "AI"
+    	fmt.Println("Mark changed his specialty")
+    	fmt.Println("His specialty is ", mark.specialty)
     	// modify age
     	fmt.Println("Mark become old")
     	mark.age = 46
@@ -157,17 +157,17 @@ All the types in Go can be used as embedded fields.
     	Human  // struct as embedded field
     	Skills // string slice as embedded field
     	int    // built-in type as embedded field
-    	speciality string
+    	specialty string
 	}
 
 	func main() {
     	// initialize Student Jane
-    	jane := Student{Human:Human{"Jane", 35, 100}, speciality:"Biology"}
+    	jane := Student{Human:Human{"Jane", 35, 100}, specialty:"Biology"}
     	// access fields
     	fmt.Println("Her name is ", jane.name)
     	fmt.Println("Her age is ", jane.age)
     	fmt.Println("Her weight is ", jane.weight)
-    	fmt.Println("Her speciality is ", jane.speciality)
+    	fmt.Println("Her specialty is ", jane.specialty)
     	// modify value of skill field
     	jane.Skills = []string{"anatomy"}
     	fmt.Println("Her skills are ", jane.Skills)
@@ -196,7 +196,7 @@ Go use a very simple way to solve it. The outer fields get upper access levels,
 
 	type Employee struct {
     	Human  // embedded field Human
-    	speciality string
+    	specialty string
     	phone string  // phone in employee
 	}