add note on confusing naming

src/system.js

@@ -326,6 +326,7 @@ async function getBlockDevices() {
     const info = safe.JSON.parse(output);
     if (!info) throw new BoxError(BoxError.INTERNAL_ERROR, `failed to parse lsblk: ${safe.error.message}`);
 
+    // despite the function and variable names, this is the partitions and not the block devices!
     const devices = info.blockdevices.filter(d => d.fstype === 'ext4' || d.fstype === 'xfs');
 
     const result = [];