DOCS: 6.7 package installation update

[suearkinunity]

Description

Updating the installation instructions for 6.7 +

Testing status & QA

Docs only

Overall Product Risks

None: docs only

Comments to reviewers

• A lot of the files have simple URL fixes, so this isn't as big as it looks. The interesting files are Index and Installation.
• Please review the steps against the core package build of the Editor.

Checklist

Before review:

• Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

[cla-assistant-unity]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@             Coverage Diff             @@
##           develop    #2470      +/-   ##
===========================================
- Coverage    78.95%   78.94%   -0.02%     
===========================================
  Files          767      767              
  Lines       140780   140796      +16     
===========================================
- Hits        111153   111148       -5     
- Misses       29627    29648      +21     

Flag	Coverage Δ
inputsystem_Windows_6000.0	5.31% <ø> (-0.01%)	⬇️
inputsystem_Windows_6000.3	5.31% <ø> (-0.01%)	⬇️
inputsystem_Windows_6000.6	5.30% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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[u-pr]

💡 Harness Review

The documentation refresh contains reader-facing correctness and completeness issues in its updated installation and introduction content.

_{Reviewed commit 9a724a1}

_{🤖 Helpful? 👍/👎}

[u-pr]

This compatibility floor conflicts with the package manifest, which declares a minimum Unity version of 6000.0. An existing project on 2021.3 through 2023 satisfies this stated requirement but cannot install this package version through UPM. State the actual minimum supported Editor version here, and keep the older-package guidance for versions below it.

_{🤖 Helpful? 👍/👎}

[u-pr]

This list item now renders as the incomplete phrase “supporting” and provides no description of what the package supports. Finish the sentence (or remove the dangling word) so the primary introduction page remains readable.

_{🤖 Helpful? 👍/👎}

[ritamerkl]

One comment- otherwise looks good.

[suearkinunity]

Moving back to draft because we don't want to merge this PR in this repo - it needs to move to unity/unity when the doc files in unity/unity are all up to date.