doc: jlink: update to v8.76

[greg-fer]

Updated shortcuts.txt to list J-Link 8.76.
NRFU-1678.

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• @qung to request merge

[NordicBuilder]

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You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-25207/nrf/releases_and_maturity/releases/release-notes-changelog.html