Make the introduction shorter and less formal

Signed-off-by: David A. Wheeler <dwheeler@dwheeler.com>

Author: david-a-wheeler

docs/CRA-Brief-Guide-for-OSS-Developers.md

@@ -1,6 +1,6 @@
 # Cyber Resilience Act (CRA) Brief Guide for Open Source Software (OSS) Developers
 
-The European Union (EU) Cyber Resilience Act (CRA) is a law that applies to software, hardware, products containing them, and their backend services, *if* they are [made available](https://eur-lex.europa.eu/eli/reg/2024/2847/oj#art_1) on the European market. The law applies *regardless* of where its developer(s) are located. This brief document aims to provide a straightforward guide for those who develop open source software (OSS). Note that *this guide is not legal advice*, it’s just an overview to help you understand the situation.
+The European Union (EU) Cyber Resilience Act (CRA) is a law that applies to software, hardware, products containing them, and their backend services, *if* they are [made available](https://eur-lex.europa.eu/eli/reg/2024/2847/oj#art_1) on the European market. The law applies *regardless* of where its developer(s) are located. This is a brief guide about the CRA for those who develop open source software (OSS). Note that *this guide is not legal advice*, it’s just an overview to help you understand the situation.
 
 ## The short version: CRA often does not apply to open source