ICU-21159 Document U_USING_DEFAULT_WARNING in .h

Document the fact
uloc_getDisplay(Language|Script|Country|Variant|Keyword|KeywordValue)
would fallback with the code, case canonicalied in same cases, and
set the status to U_USING_DEFAULT_WARNING.

No change to the implementation behavior. Only complete the missing
comments and tweak line wrap, remove double spaces and add test to
validate this pre-existing behavior that I added the documents now.
3 files changed
tree: 0b6060c34b2d235d0639ad8a292b2103b57265af
  1. .ci-builds/
  2. .github/
  3. docs/
  4. icu4c/
  5. icu4j/
  6. tools/
  7. vendor/
  8. .appveyor.yml
  9. .cpyskip.txt
  10. .gitattributes
  11. .gitignore
  12. .travis.yml
  13. KEYS
  14. README.md
README.md

International Components for Unicode

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