Likely misunderstanding about --show-headers

[tkzv]

Specify which documentation you found a problem with

docs/cmdline-opts/show-headers.md

The problem

"Show response headers in the output." does not say if the output is always stdout or stderr (as for progress indicator) of if it is affected by --output, --remote-name and --remote-name-all. This may be confusing as in #15604.

The manual should say something like "With options -o, --output, -O, --remote-name and --remote-name-all the header is written at the start of the file."