References to Unicode documents are unnecessarily inconsistent

[gibson042]

ECMA-402 makes many references to Unicode documents, but does so inconsistently:

$ grep --no-filename -ro 'U[[:alpha:]]* *[A-Z][[:alpha:]]* *[A-Z][[:alpha:]]* *#*[0-9][0-9]*' spec/ | sort | uniq -c
     12 Unicode BCP 47
      1 Unicode Technical Standard 10
     15 Unicode Technical Standard 35
     12 Unicode Technical Standard #35
     14 UTS 35
      6 UTS #35

It would be better to uniformly adopt a consistent pattern. Unicode itself appears to prefer expanded spellings with number sign, as visible at e.g. https://unicode.org/glossary/ .

[ben-allen]

Is this one still open? Currently the only occurrence of irregular references is in a table heading where changing from UTS would result in awkward rendering.

[gibson042]

I guess it's done!

[ben-allen]

While I was poking at this I realized that there's several references to Unicode Technical Standard # 35 that don't provide links or references to the relevant portion of the standard. I've got a PR for it I can put up, if doing that will help us better adhere to the style guide