[No QA] [NO QA] Docs updates for E/A#88900 Update Spend tab names to match UI

[MelvinBot]

Summary

Updates help site navigation references in Approve-Expenses.md to match the UI label changes from #88900, which renamed:

• Spend > All expenses → Spend > Expenses
• Spend > All reports → Spend > Reports

Three references were updated in the article's step-by-step instructions.

Related PR

#88900 — Drop "All" from "All reports", "All expenses" in Spend tabs

Test plan

• Verify the rendered help article at docs/articles/new-expensify/reports-and-expenses/Approve-Expenses.md displays the updated navigation labels
• Confirm the labels match the live UI after Drop "All" from "All reports", "All expenses" in Spend tabs #88900 merges

[OSBotify]

A preview of your ExpensifyHelp changes have been deployed to https://033c83c2.helpdot.pages.dev ⚡️

Updated articles:

• articles/new-expensify/reports-and-expenses/Approve-Expenses