docs: admin-guide: merge sections for the kernel.modprobe sysctl

Documentation for the kernel.modprobe sysctl was added both by
commit 0317c5371e6a ("docs: merge debugging-modules.txt into
sysctl/kernel.rst") and by commit 6e7158250625 ("docs: admin-guide:
document the kernel.modprobe sysctl"), resulting in the same sysctl
being documented in two places.  Merge these into one place.

Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Stephen Kitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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