fix(openapi): correct YAML quote indentation for spec compliance

[abdelhadi703]

Summary

Fixes closing single quotes in multiline YAML strings within openapi.yaml that were incorrectly placed at column 0 instead of matching the indentation level of their opening quotes (24 spaces).

Changes

• Fixed 5 closing single quotes in the OCR endpoint (/v1/ocr) example response that had incorrect indentation (lines 1984, 2001, 2022, 2039, 2050)
• These quotes terminated multiline markdown field values in the userExample response

Why

While PyYAML tolerates closing quotes at any indentation level, stricter YAML parsers reject this as invalid YAML syntax. The incorrect indentation makes the OpenAPI spec non-portable across different YAML processing tools.

Verification

• Validated the corrected file parses as valid YAML (yaml.safe_load)
• Validated against OpenAPI 3.1 specification using openapi-spec-validator
• Confirmed all data content (markdown text, page counts, etc.) remains identical after the fix

Fixes #379

Note: Issue #273 (EmbeddingResponse items array vs object) appears to have been resolved in a previous docs update — the current openapi.yaml already uses the correct object syntax for items.

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[abdelhadi703]

Hi @mistralai/team,

Gentle ping on this OpenAPI spec fix. It corrects YAML quote indentation for spec compliance.

Ensures proper parsing by tools. Thanks!