Update instructions to list source maps via node

[afvalenciab]

• What problems does this PR solve?
  Fix the instructions to list source maps via node, because the instructions are wrong and different to npm instrucctions.
• Add any context that will help us review your changes such as testing notes,
  links to related docs, screenshots, etc.

Before:

`var listSourcemaps = require(‘@newrelic/publish-sourcemap’).listSourcemaps

listSourcemaps({
  sourcemapPath: 'SOURCE_MAP_FULL_PATH',
  javascriptUrl: 'JS_URL',
  applicationId: <var>YOUR_NEW_RELIC_APP_ID</var>,
  apiKey: '<var>YOUR_NEW_RELIC_USER_API_KEY</var>',
}, function (err, res) { console.log(err || res.body)})`

After:

` var listSourcemaps = require(‘@newrelic/publish-sourcemap’).listSourcemaps

listSourcemaps({
  applicationId: <var>YOUR_NEW_RELIC_APP_ID</var>,
  apiKey: '<var>YOUR_NEW_RELIC_USER_API_KEY</var>',
  limit: [Max number of results to return || 20]: ,
  offset: [Number of results to skip before returning || 0]: ,
}, function (err, res) { console.log(err || res.body)})`

Please follow conventional commit standards
in your commit messages and pull request title.

Give us some context

• What problems does this PR solve?
• Add any context that will help us review your changes such as testing notes,
  links to related docs, screenshots, etc.
• If your issue relates to an existing GitHub issue, please link to it.

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[github-actions]

Hi @afvalenciab 👋
Thanks for your pull request! Your PR is in a queue, and a writer will take a look soon. We generally publish small edits within one business day, and larger edits within three days.

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[zuluecho9]

@afvalenciab Hi Andres. Could you by chance give us a little more information on why you suggested that change? I'm trying to get some input from source map-knowledgeable people but in meantime I thought a little more detail about what you were thinking might help me/us get to the bottom of this.

And thank you very much for your suggestions!

[zuluecho9]

@afvalenciab Actually, I talked to support and they approved this, so thank you much for that.