bip3: mention posting a dedicated ML thread

Author: jonatack

bip-0003.md

@@ -201,7 +201,7 @@ the relevant project.
 
 The authors should first research whether their idea has been considered before. Ideas in Bitcoin are often rediscovered,
 and prior related discussions may inform the authors of the issues that may arise in its progression. After some investigation,
-the novelty and viability of the idea should be tested by posting about the idea to the [Bitcoin Development Mailing
+the novelty and viability of the idea should be tested by posting a new, dedicated thread about the idea to the [Bitcoin Development Mailing
 List](https://groups.google.com/g/bitcoindev). Prior correspondence can be found in the [mailing list
 archive](https://gnusha.org/pi/bitcoindev/).