docs: ads-api campaigns use LINE_ITEM budget optimization only

[mbhatiai]

Summary

Updates the Campaign Management API reference to reflect that campaigns only support LINE_ITEM budget optimization (CAMPAIGN-level budget optimization is no longer supported).

• budget_optimization: documents LINE_ITEM as the only possible value and the default (was CAMPAIGN), in both the create (POST) and update (PUT) parameter tables.
• standard_delivery: marked deprecated at the campaign level — standard vs. accelerated delivery is now configured on the line item via its own standard_delivery parameter.
• Example requests/responses updated to match: budget_optimization CAMPAIGN → LINE_ITEM, campaign-level standard_delivery → null, and dropped standard_delivery from the create example request. Also fixed the CAMPIAGN typo in the example URL.

This aligns the docs with the X Ads Manager UI, which always sends budget_optimization: LINE_ITEM and sets pacing/standard_delivery per line item.

Scope

Single file: x-ads-api/campaign-management/reference.mdx (22 insertions, 23 deletions). No content changes outside the campaign endpoints; the unrelated entity_type enum and line-item standard_delivery docs are untouched.

Test plan

• Verify the rendered budget_optimization and standard_delivery parameter tables on the create/update campaign sections
• Confirm example JSON blocks still parse and read consistently

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[CLAassistant]

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