docs: adopt host's expectations about naming of warmup-function and -…

[earloc]

fixes #124930

[prmerger-automator]

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[learn-build-service-prod]

Learn Build status updates of commit 93fc56d:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
articles/azure-functions/functions-bindings-warmup.md	⚠️Warning		Details

articles/azure-functions/functions-bindings-warmup.md

• Line 95, Column 1: [Warning: invalid-code] The code snippet "~/azure-functions-nodejs-v4/js/src/functions/warmupTrigger.js" could not be found.
• Line 133, Column 1: [Warning: invalid-code] The code snippet "~/azure-functions-nodejs-v4/ts/src/functions/warmupTrigger.ts" could not be found.

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[earloc]

where are those samples located?

~/azure-functions-nodejs-v4/ts/src/functions/warmupTrigger.ts

[earloc]

where are those samples located?

~/azure-functions-nodejs-v4/ts/src/functions/warmupTrigger.ts

found it:
Azure/azure-functions-nodejs-samples#33

[Jak-MS]

@ggailey777
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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