Update usability-sessions-round-1-invitation.md

docs/usability-sessions-round-1-invitation.md

@@ -13,11 +13,11 @@ Logistics:
 - 30-minute slots Mon Feb 19 (yes, this is indeed a US federal holiday) through Fri Feb 23 at starting times of 9am, 9:30am, 10am, 2pm, 2:30pm, and 3pm (US Eastern Time, i.e. -05:00 offset from UTC)
 - you will receive $50 USD for your time
 - session will be over Zoom. In-person option in New York City (Hamilton Heights) -- indicate via email if this is of interest (intended for NYC locals, i.e. no travel stipend).
-- email topst-helio@polyneme.xyz with
+- email [topst-helio@polyneme.xyz](mailto:topst-helio@polyneme.xyz) with
   - at least three (3) slots that could work for you (you may indicate preferences)
   - your career stage / role (can choose more than one): student, researcher, manager
   - your country of residence; if in USA, also your state/territory of residence.
 
-[^1]: https://en.wikipedia.org/wiki/Software_release_life_cycle
-[^2]: https://openscience101.org/
-[^3]: https://carpentries.org/
+[^1]: <https://en.wikipedia.org/wiki/Software_release_life_cycle>
+[^2]: <https://openscience101.org/>
+[^3]: <https://carpentries.org/>