Add ability for links within descriptions of properties set in the openapi.json file to open in a new tab.

[jfishman1]

When adding links in the description for properties in the openapi.json file, if clicked in the "try it" mode, they open in the same tab, causing users to lose properties currently set for testing and need to restart.

https://share.zight.com/2NueOZqQ

If clicking the link would open in a new tab, then the user won't lose their data.