Merge pull request #133 from TheAxonLab/fix/wrong-icon

FIX: Wrong icon for the closed lock position in session teardown

docs/data-collection/tear-down.md

@@ -99,5 +99,5 @@
 - [ ] Turn off the satellite station ({{ secrets.hosts.console_left | default("███") }}, the computer on the left side of the control desk)
 - [ ] Turn off the control station ({{ secrets.hosts.console_right | default("███") }}, the computer on the right side of the control desk)
 - [ ] Push the blue button displaying an overdotted circle and the **SYSTEM OFF** label above, which is found right above the key
-- [ ] Turn the key into the *closed lock* position (:fontawesome-solid-unlock:)
+- [ ] Turn the key into the *closed lock* position (:fontawesome-solid-lock:)