Touchup docs

Author: horenmar

docs/thread-safety.md

@@ -17,7 +17,7 @@ The message macros are likely to be made thread-safe in the future, but
 the way sections define test runs is incompatible with user being able
 to spawn threads arbitrarily, thus that limitation is here to stay.
 
-**[Important: thread safety in Catch2 is opt-in](configuration.md#experimental-thread-safety)**
+**Important: thread safety in Catch2 is [opt-in](configuration.md#experimental-thread-safety)**
 
 
 ## Using assertion macros from multiple threads