hwmon: (coretemp) Document sysfs numbering and label meaning

The documentation says that all sysfs entries are named with their
core_id, and that the "Core X" label contains the processor number.
Neither is accurate. create_core_attrs() numbers the per-core
attributes core_id + 2 and always uses temp1 for the package sensor,
and show_label() prints topology_core_id(), not the logical CPU
number.

The difference is easy to see on hybrid CPUs. On an i7-14700F, the
"Core 4" label is on temp6 and belongs to CPUs 2 and 3, and the
E-cores report core IDs 32 to 43.

Describe the actual numbering.

The mismatch was found by an LLM comparing the documentation with the
code, and verified on the i7-14700F above.

Assisted-by: LLM
Signed-off-by: Asaf Nuri Bertizlioğlu <ycistak@gmail.com>
Tested-by: Ximing Zhang <xzhangjr@gmail.com>
Reviewed-by: Ximing Zhang <xzhangjr@gmail.com>
Link: https://patch.msgid.link/20261015171759.704526-1-ycistak@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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