It looks to me like the description is still referring to the way receipts used to work in XUL. I think it's meant to read this way (for example):
Text to be inserted into Print Templates in place of {{includes.alert_text}}
It looks to me like the description is still referring to the way receipts used to work in XUL. I think it's meant to read this way (for example):
Text to be inserted into Print Templates in place of {{includes. alert_text} }