Boil it down to concise and precise. Say the key stuff first, contextual stuff later. Use formatting (e.g. emphasis, bullets and tables) only when it aids clarity.
Do it in your bug reports, especially, but it can apply to every communication you have with your colleagues and customers. They will notice and they will thank you for it. You will be pestered less for clarification and further information. You, your team and your company will function that little bit better each time.