update-vndk-list.sh delinated with ticks in error

People have asked me on several occassions how to fix this error. It's
somewhat confusing since scripts aren't usually on a path. However, in
this case, the script is added to the path on host. Hopefully, using
tick marks here will make that more clear.

Bug: N/A
Test: N/A
Change-Id: I8601a5a9eb348b2e358875b45eae57ec910c9a06