Refactor code to remove unnecessary package and unused imports

docs/golang/concepts/12) slices2.go

@@ -5,7 +5,7 @@ import "fmt"
 func main() {
 	// remove an element from a slice
 	var cars = []string{"BMW", "Audi", "Mercedes", "Ford", "Fiat"}
-
+	
 	fmt.Println(cars)
 	var index int = 2
 	// We are concatenating two slice and rewriting the 1st Slice.

docs/golang/concepts/33) channels-open.go

@@ -25,6 +25,6 @@ func main() {
 		wg.Done()
 
 	}(myChannel, wg)
-
+	
 	wg.Wait()
 }

docs/golang/introduction.md

@@ -405,11 +405,11 @@ A method is a function with a special receiver argument. The receiver appears in
 
 1. **Value Receiver**:  It is used when we don't want to modify the original value. 
 
-> func (t Test) printName() { fmt.Println(t.Name) }
+> `func (t Test) printName() { fmt.Println(t.Name) }`
 
 2. **Pointer Receiver**: It is used when we want to modify the original value. 
 
->  func (t *Test) printName() { fmt.Println(t.Name) }
+> `func (t *Test) printName() { fmt.Println(t.Name) }`
 
 Here's what a receiver does:
 
@@ -665,16 +665,16 @@ func main() {
         fmt.Println("Hello")
     }()
 }
-```
+``` -->
 
-### Race Conditions
+<!-- ### Race Conditions
 
 Race Conditions occur when two or more goroutines access the same variable concurrently and at least one of the accesses is a write. It can lead to unpredictable results.
 
 We can check whether there is a race condition in our code by using the `-race` flag.
 
 ```bash
-$ go run --race main.go
+go run --race main.go
 ```
 
 To avoid the race condition we can use the `sync` package. We can use the `Mutex` type to lock the variable.