[Bug] script name error in documentation

[jxuamazon]

Describe the bug
solutions/swb-reference/README.md . the name of the script should be generateCognitoTokens.js (missing "s")

STAGE= node generateCognitoToken.js ''

should be

STAGE= node generateCognitoTokens.js ''

To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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• Release Version installed or commit hash [e.g. v1.0.3, 1edf4]

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