write-out.d: add 'since version' to %{header_json} documentation

The documentation of `%{header_json}` missed to mention since which
version this variable for `--write-out` is present.

Based on commit https://github.com/curl/curl/commit/4133a69f2daa476bb
we can determine from the tags were this commit is present that the
first version to include it was `7.83.0`.
This could be also checked with:
`git tag --contains 4133a69f2daa476bb6d902687f1dd6660ea9c3c5`

Closes #10395
This commit is contained in:
Martin D'Aloia 2023-02-01 22:27:23 -03:00 committed by Daniel Stenberg
parent 7305ca63e2
commit 3cc9df1817
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@ -65,7 +65,7 @@ server. (Added in 7.15.4)
.B header_json
A JSON object with all HTTP response headers from the recent transfer. Values
are provided as arrays, since in the case of multiple headers there can be
multiple values.
multiple values. (Added in 7.83.0)
The header names provided in lowercase, listed in order of appearance over the
wire. Except for duplicated headers. They are grouped on the first occurrence