Document php-version can come from platform overrides in composer.lock or composer.json

[davereid]

---

name: ⚙ Improvement
about: Add documentation that php-version can come from the platform override version set in composer.lock or composer.json
labels: enhancement

---

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Description

This PR documents the behavior in the readPHPVersion() method in utils.js

In case this PR introduced TypeScript/JavaScript code changes:

• [na] I have written test cases for the changes in this pull request
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• [na] npm test returns with no unit test errors and all code covered.

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