Fix Shipping.yaml: remove tab characters and add missing array items

[kruegge82]

Summary

Shipping.yaml currently fails to parse with standard YAML parsers and does not pass OpenAPI validation. This PR fixes two issues:

1. Tab characters in the YAML

YAML forbids tab characters for indentation. The spec contained 46 lines with literal tabs; two places break parsing entirely:

• Lines ~4784-4785: continuation lines of the "Description of Goods" description are indented with tabs
• Line ~13707: trailing tabs after the "UPS Premium Care Form container" description

Parsing with snakeyaml (used by swagger-parser and openapi-generator) fails with:

found character '\t(TAB)' that cannot start any token. (Do not use \t(TAB) for indentation)
in 'string', line 13707, column 86

All tab characters have been replaced with spaces (the remaining occurrences were inside description texts, e.g. the Incoterms and unit-of-measurement lists).

2. Product_ProductIdentifier is an array without items

The schema is declared as type: array but defines its object fields directly under properties. Validators report:

attribute components.schemas.Product_ProductIdentifier.items is missing

The object definition has been moved into items, and maximum: 6 was changed to maxItems: 6, the correct keyword for constraining array length.

Verification

openapi-generator-cli validate -i Shipping.yaml completes without errors after these changes (only pre-existing "unused model" recommendations remain).

🤖 Generated with Claude Code

[kruegge82]

@xerc is it possible to merge or i have to do anything?

[xerc]

@kruegge82 i dont know the status - you might have to ask someone in upper managment or better CTO

did a lot of cleanup (over a year ago) ; #165 & #186 but THEY refused to include them after THEY broke it ..
motivation droped rapidly esp. cause THEY even refuse to use correct international DATE standarts @ #99

[kruegge82]

@RohiniA-DevPortal can you merge a pull request, or can i do anything?