Update sensor-architecture.md link
Update sensor-architecture.md link

sensor-architecture.md is moving under architecture/ as part of
https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/26251/

26251 should merge before this is merged.

Change-Id: I3d01bf49d4bf22a18c74a96d0547dcbd060ef046
Signed-off-by: Gunnar Mills <213d3186dd7abf62ec3e856bb92d7b256149744c@us.ibm.com>

openbmc/phosphor-hwmon,openbmc/phosphor-hwmon