fix examples/notebook/README.md
fix examples/notebook/README.md

google/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools