Update QemuVectorTesting documentation

Additions
- Add gdb cli invocation as alternate to gdbgui

Updates
- Fix some spelling errors
- Fix aliases to work with paths based on `$ROOTDIR`
- Update paths (b/c some files moved and removed any absolute paths)

Change-Id: Ic0cd347ee0c61489135f214820cdac0ad1fa76c5
1 file changed