Packages.md

[dewimagento]

Purpose of this pull request

This PR updates the packages.md file:

• Fix "smart" unicode quotes throughout to correctly be the " and ' characters.
• Wrap lines to ~120 chars throughout.
• Remove all references to the DELETE package endpoint, no longer available to users
• Revamped the parameter reference table; added missing params, renamed obsolete ones, added a column for filterability, and one for the valid values. Worried this might make it look very wide or word-wrapped, my previewer isn't great :( But that'll be cosmetic, can fix later. The data is there, now.
• Added missing object definitions (browsers, technical options)
• Minor clarifications and corrections on things like the behavior of validation.

Affected DevDocs pages

https://devdocs.magento.com/guides/v2.3/marketplace/eqp/packages.html

[devops-devdocs]

An admin must run tests on this PR before it can be merged.

[ghost]

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