typo in chapter vector

Chapter about vectors: 

> ⭐️ Mainly a vector represent 3 things,
> 
> -     A pointer to the data
> -     No of elements currently have(length)
> -     Capacity (Amount of space allocated for any future elements).

I think it´s supposed to be "number of elements currently have(length)". Sorry if it is correct. I am not a native English speaker, but it confused me. 

awesome work, keep it up!