[OpenMP][NFC] Fix typo in libomptarget error message

Summary:
There was a typo suggesting the user to use `LIBOMPTARGET_DEBUG` instead of
`LIBOMPTARGET_INFO`

openmp/libomptarget/src/omptarget.cpp

@@ -222,7 +222,7 @@ void handleTargetOutcome(bool Success, ident_t *Loc) {
         for (auto &Device : PM->Devices)
           dumpTargetPointerMappings(Loc, Device);
       else
-        FAILURE_MESSAGE("Run with LIBOMPTARGET_DEBUG=%d to dump host-target "
+        FAILURE_MESSAGE("Run with LIBOMPTARGET_INFO=%d to dump host-target "
                         "pointer mappings.\n",
                         OMP_INFOTYPE_DUMP_TABLE);