doc: libraries: modem_battery: fix typo

[MirkoCovizzi]

The upper bound of the voltage range was erroneously specified as 3500 mV when, instead, it should be
5000 mV according to the technical documentation
for %XVBATLOWLVL.

[MirkoCovizzi]

Reference: https://docs.nordicsemi.com/bundle/ref_at_commands/page/REF/at_commands/mob_termination_ctrl_status/xvbatlowlvl_set.html

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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-21219/nrf/libraries/modem/modem_battery.html