docs: fix notebook link in docs

[laurenzse]

The links in the documentation to the original notebooks are currently broken. This PR introduces the missing / to the links:

Original link:

https://github.com/deepcharles/rupturesblob/master/docs/examples/music-segmentation.ipynb

New link:

https://github.com/deepcharles/ruptures/blob/master/docs/examples/music-segmentation.ipynb

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (03ff932) 98.77% compared to head (0f1fadf) 98.77%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #315 +/- ## ======================================= Coverage 98.77% 98.77% ======================================= Files 40 40 Lines 978 978 ======================================= Hits 966 966 Misses 12 12 ``` | [Flag](https://app.codecov.io/gh/deepcharles/ruptures/pull/315/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Charles+T.) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/deepcharles/ruptures/pull/315/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Charles+T.) | `98.77% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Charles+T.#carryforward-flags-in-the-pull-request-comment) to find out more.

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[oboulant]

Thanks ! I will regenerate the docs once this is merged !

[oboulant]

Docs regenerated and online ! GHA run : https://github.com/deepcharles/ruptures/actions/runs/7024108194 ruptures docs, still here : https://centre-borelli.github.io/ruptures-docs/