Fix link to performance page

[ROCm/rccl-tests commit: db39a88f8a]

projects/rccl-tests/README.md

@@ -36,7 +36,7 @@ $ mpirun -np 40 ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 4 -c 0
 
 ### Performance
 
-See the [doc/PERFORMANCE.md](Performance) page for explanation about numbers, and in particular the "busbw" column.
+See the [Performance](doc/PERFORMANCE.md) page for explanation about numbers, and in particular the "busbw" column.
 
 ### Arguments