Update Manipulating Arrays.md
Update Manipulating Arrays.md

Based on the documentation:
array.splice(index, howMany, [element1][, ..., elementN]);

The mistake part is "myArray.splice(3,7);", which takes out 7 items instead of 5.
I have corrected it to "myArray.splice(3,5);" as the tutorial said.
ronreiter/interactive-tutorials,ronreiter/interactive-tutorials,ronreiter/interactive-tutorials