TemplateSrv: Formatting options for ${__from} and ${__to}, unix seconds epoch, ISO 8601/RFC 3339 (#26466) * TemplateSrv: WIP date formats * Templating: formats with arguments * WIP docs updates * Docs: Updated docs * fixed spelling * Update docs/sources/variables/global-variables.md Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com> * Update docs/sources/variables/global-variables.md Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com> * Update docs/sources/variables/global-variables.md Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com> * Update docs/sources/variables/global-variables.md Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com> Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
