docs: replace dummy with placeholder in example comments

[stuckvgn]

Summary

• Replaces the term dummy with placeholder in three example file comments
• No functional changes - these are comment-only updates
• Aligns with inclusive language best practices

Files changed

• examples/ejs/index.js: Dummy users to Placeholder users
• examples/route-middleware/index.js: Dummy users to Placeholder users
• examples/auth/index.js: dummy database to placeholder database

Context

The Inclusive Naming Initiative lists dummy as a Tier 3 term to replace when possible. Placeholder is a more precise and neutral alternative that better describes the purpose of the test data in these examples.

Test plan

• No tests affected - changes are limited to code comments in example files
• Verified no other occurrences of dummy exist in the examples directory

[UlisesGascon]

the CI issue is not related to this (503 code error in the coverage upload service), I can retry it again in few hours (ref):

<p>You've requested a page on a website (coveralls.io) that is on the <a href="https://www.cloudflare.com/5xx-error-landing/" target="_blank">Cloudflare</a> network. Cloudflare is currently unable to resolve your requested domain (coveralls.io).</p>

[stuckvgn]

Thanks for the context, @UlisesGascon — just tried pushing a re-trigger commit and hit the same coveralls.io 503. Will leave it with you to retry once the service recovers.

[stuckvgn]

@UlisesGascon Quick nudge — any chance the coverage job can be re-run or bypassed for merge? All tests pass across the full Node matrix, it's just the coveralls 503 holding things up.