Wiki page doesn't render Textile - Definition list syntax with correct output (BB-16098)

###Summary###
Textile syntax - Definition lists on a wiki page doesn't render the correct output

###Steps to Reproduce###

1. Copy the text in the textbox from https://txstyle.org/doc/10/definition-lists
2. Paste it on a wiki page
3. Set the format to textile
4. Hit preview

###Expected Results###

###Actual Results###