treewide: fix paths for relocated files in comments

After the docs directory restructuring, several comments
refer to paths that no longer exist.

Replace these references to the current file locati

treewide: fix paths for relocated files in comments

After the docs directory restructuring, several comments
refer to paths that no longer exist.

Replace these references to the current file locations
so readers can find the correct files.

Related commits
---------------

189c099f75f (Jul 2021)
docs: collect the disparate device emulation docs into one section
Rename docs/system/{ => devices}/nvme.rst

5f4c96b779f (Feb 2023)
docs/system/loongarch: update loongson3.rst and rename it to virt.rst
Rename docs/system/loongarch/{loongson3.rst => virt.rst}

fe0007f3c1d (Sep 2023)
exec: Rename cpu.c -> cpu-target.c
Rename cpus-common.c => cpu-common.c

42fa9665e59 (Apr 2025)
exec: Restrict 'cpu_ldst.h' to accel/tcg/
Rename include/{exec/cpu_ldst.h => accel/tcg/cpu-ldst.h}

Signed-off-by: Sean Wei <me@sean.taipei>
Message-ID: <20250616.qemu.relocated.06@sean.taipei>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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