Update 11.2.md

typographical errors and improved readability

en/11.2.md

@@ -233,7 +233,7 @@ Let's say that you need to change the context variables in the current execution
 	Breakpoint 1, main.main () at /home/xiemengjun/gdbfile.go:23
 	23 fmt.Println("count:", count)		
 
-Finally, while running, the program creates a number of number goroutines. We can see what each goroutine is doing using `info goroutines`:
+Finally, while running, the program creates a number of goroutines. We can see what each goroutine is doing using `info goroutines`:
 
 	(gdb) info goroutines
 	* 1 running runtime.gosched