LICENSE-CODE should be copyright OTel authors

[chalin]

Originally posted by @chalin in #3678 (comment)

... LICENSE-CODE file needs further changes, the copyright notice is for the code in this repo, not the code in the documentation AFAIK.

[svrnm]

good point, this may be confusing otherwise

[chalin]

Closing this, after some thought: I'm ok just using the boilerplate raw text of the license. Feel free to reopen if you think we should follow through and make the changes actually suggested by the template itself :).