Update quick-sort.md

[manikanta-manii]

Previous code was having Array Index Bound Error in it , so i made changes in code . Changes made are:

1. pointer i was incrementing if arr[i] is less than or equal to pivot this was leading it cross the boundary , which is at that iteration i will be greater than high . then again while checking condition it was trying to access the high'th element which was giving "Array Index Out Of Bound" error . solution : if ( i<=high && arr[i] <=pivot ) then i++ ;

similarly for j pointer : if(j>=low && arr[j] >=pivot) then j-- ;

📌📌 please update this in your web page ........ ❤️❤️ If possible give some credit :

https://github.com/manikanta-manii