Avoid disparaging language

The word "dogmatic" has negative assocations with "irrational" and "unwilling to change ones mind".  The word "opinionated" on the other hand is more neutral and even positive in many situations. This is more fitting, because we're not trying to argue that the approaches of other languages are inherently worse than Rust's.

Author: senekor

src/ch16-00-concurrency.md

@@ -28,7 +28,7 @@ subtle bugs and is easy to refactor without introducing new bugs.
 > parallel_ whenever we use _concurrent_. In the next chapter, where the
 > distinction matters more, we’ll be more specific.
 
-Many languages are dogmatic about the solutions they offer for handling
+Many languages are opinionated about the solutions they offer for handling
 concurrent problems. For example, Erlang has elegant functionality for
 message-passing concurrency but has only obscure ways to share state between
 threads. Supporting only a subset of possible solutions is a reasonable