Docs updates for E/A#98368 Editing existing manual and odometer distance expenses

[MelvinBot]

Explanation of Change

Help site follow-up to #98368, which made an existing manual or odometer distance expense editable even when the workspace requires map or GPS distance. The creation guard previously fired on edit too, so members were blocked from changing the distance on expenses they created before the workspace turned the requirement on.

The Require GPS or map entry setting was not documented on the help site at all, so neither the rule nor this new exception to it was discoverable. This PR documents both.

docs/articles/new-expensify/workspaces/Set-distance-rates.md (admin-facing)

• Added How to require GPS or map entry for distance expenses — what the setting does and the steps to enable it on Distance rates > Settings.
• Added What happens to existing manual and odometer expenses when you require GPS or map entry — states that the setting applies to new expenses only and that pre-existing manual and odometer expenses stay editable until approved.
• Added two FAQ entries and expanded keywords / internalScope.

docs/articles/new-expensify/reports-and-expenses/Distance-Expenses.md (member-facing)

• Added a note to the manual and odometer creation sections explaining that those options are unavailable when the workspace has Require GPS or map entry enabled, and what the blocking message says.
• Added a paragraph to How to edit an existing Distance expense covering the behavior this PR shipped.
• Added two FAQ entries and expanded keywords.

Scope note: commuter exclusions ("Exclude commutes") is the other setting that forces map or GPS distance, and it is also touched by #98368. It is deliberately not documented here because it is still gated behind the commuterExclusions beta (src/pages/workspace/distanceRates/PolicyDistanceRatesSettingsPage.tsx) and is not visible to general users yet. The "Why can't I turn off Require GPS or map entry?" FAQ describes the locked-toggle behavior generically so the article stays accurate without naming a beta feature. It should be expanded once commuter exclusions goes GA.

UI verification: the labels used here were checked against dev NewDot on web — the Distance rates page, its Settings button, and the Require GPS or map entry toggle with the subtitle "Manual and odometer entry will be disabled." The blocking modal copy ("This workspace requires either map-based or GPS-tracked distance expenses." with a Got it button) comes from src/languages/en.ts and was not screen-confirmed.

Fixed Issues

$ #98223
PROPOSAL: N/A — documentation follow-up to #98368

Tests

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// Please describe what tests you performed that validates your changed worked.

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Offline tests

QA Steps

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".
// Please describe what QA needs to do to validate your changes and what areas do they need to test for regressions.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

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@fedirjh, please review the files changed and confirm they reflect the current behavior. Then post a new comment saying @MelvinBot mark this PR as ready for review.