Adjust text 800 line height

[danielguillan]

Summary

Adjusts the typographic token for text-800-line-height to 100% on large viewports. This aligns Heading 2 in both design and implementation.

Supporting resources (related issues, external links, etc):

• Fixes https://github.com/github/primer/issues/3949

Contributor checklist:

• [x] All new and existing CI checks pass
• [x] Tests prove that the feature works and covers both happy and unhappy paths
• [x] Any drop in coverage, breaking changes or regressions have been documented above
• [x] New visual snapshots have been generated / updated for any UI changes
• [x] All developer debugging and non-functional logging has been removed
• [x] Related issues have been referenced in the PR description

Reviewer checklist:

• [ ] Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• [ ] Check that tests prove the feature works and covers both happy and unhappy paths
• [ ] Check that there aren't other open Pull Requests for the same update/change

Screenshots:

Please try to provide before and after screenshots or videos

Before	After

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 073c7101ac07aada17297c4f85f4b45f46d3f4bf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | ------------------------ | ----- | | @primer/brand-primitives | Patch | | @primer/react-brand | Patch | | @primer/brand-e2e | Patch | | @primer/brand-fonts | Patch | | @primer/brand-config | Patch | | @primer/brand-storybook | Patch |

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[github-actions[bot]]

🟢 No design token changes found

[github-actions[bot]]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.