Remove references to the string problems in "Tips & suggestions"
Remove references to the string problems in "Tips & suggestions"

There are references to the string problems (palindrome and disemvowel) in the tips that needed to be removed.

UMM-CSci-3403-Fall-2017/lab-3-c-programming-arrays-kaisong,UMM-CSci-3403-Fall-2017/lab-3-c-programming-arrays-kaisong