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Some flag descriptions contain point-brackets to indicate required
options, e.g.:
--ssh stringArray SSH agent socket or keys to expose to the build (format: default|<id>[=<socket>|<key>[,<key>]])
When rendering those options as HTML, those options were not visible as
they were rendered as a HTML element.
Given that flag-descriptions are not expected to have MarkDown or HTML
formatting, we can HTML-escape them to prevent this.
This patch escapes the flag-descriptions using liquid's `esacape` command.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>