missing HexString documentation

[Seb]

On Wednesday, 7 February 2018 at 15:41:37 UTC, Seb wrote:
> On Wednesday, 7 February 2018 at 15:25:05 UTC, Steven 
> Schveighoffer wrote:
>> On 2/7/18 9:59 AM, Ralph Doncaster wrote:
>>> [...]
>>
>> Good catch! Even the grammar says nothing about what it is, 
>> except it has HexString as a possible literal.
>>
>> Can you file an issue? https://issues.dlang.org
>>
>> -Steve
>
> They are deprecated:
>
> https://dlang.org/changelog/pending.html#hexstrings
> https://dlang.org/deprecate.html#Hexstring%20literals
>
> Hence, the grammar has been incompletely updated. As it's not 
> an error to use them now, it should have stated that they are 
> deprecated.
>
> Anyhow, you can always go back in time:
>
> https://docarchives.dlang.io/v2.078.0/spec/lex.html#HexString

PR: https://github.com/dlang/dlang.org/pull/2190