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Update docs/cmdline-opts/write-out.md

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Co-authored-by: Daniel Stenberg <daniel@haxx.se>
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docs/cmdline-opts/write-out.md
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@ -57,12 +57,11 @@ when using this option to properly escape. If this option is used at the
command prompt then the % cannot be escaped and unintended expansion is
possible.
The option allow a filter to be added to the variables that express a size.
This allow to convert the size using the standard suffixes K, M, G... like
what's printed by default on the CLI. The filter allow maximum 4 digits plus
one suffix character. To use it, add the `:pretty` suffix to the variable. For
example, `--write-out '%{size_download:pretty}'`. This only works with variable
that output a size like parameter
To format numerical output for better human readability, append the `:pretty`
modifier to a numerical variable name (e.g., `--write-out '%{size_download:pretty}'`).
This modifier applies standard SI metric suffixes (K, M, G, etc.) and
constrains the output to a maximum width of 5 characters, including the
suffix. This works only with numerical variables.
The variables available are: