Typo word "electgrodes" delete the "g" SHHS page 4-equipment-shhs1 Technical Notes SHHS1

[JLArnold]

https://www.sleepdata.org/datasets/shhs/pages/4-equipment-shhs1.md

SHHS page 4-equipment-shhs1 Technical Notes for SHHS1 Sensors typo “electgrodes” should be “electrodes”