Instructed to run `firebase deploy` from wrong directory

[jbthn]

I'm following the Level 2 codelab instructions, and when I got to the "Deploy your fulfillment" section of step 3 ("Set up for local development") I got the following error when trying to run firebase deploy:

Error: ENOENT: no such file or directory, stat 'functions/package.json'
    at Object.statSync (fs.js:932:3)
    at Object.fs.statSync (pkg/prelude/bootstrap.js:983:32)
    at Object.load (/Users/<user>/.cache/firebase/tools/lib/node_modules/cjson/index.js:200:12)
    at getRuntimeChoice (/Users/<user>/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/parseRuntimeAndValidateSDK.js:55:26)
    at module.exports (/Users/<user>/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/deploy/functions/prepare.js:26:29)
    at _chain (/Users/<user>/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/deploy/index.js:22:40)
    at /Users/<user>/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/deploy/index.js:63:16
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

Since the debug logs made it seem like the deploy command was looking for functions/package.json, I thought the earlier instruction to navigate to /level2/functions before running firebase deploy might be incorrect. When I tried cd .. and re-ran the deploy command, and it worked.

It looks like the documentation should be updated to indicate that firebase deploy should be run from codelabs-nodejs/level2, not from the functions directory.