Merge pull request #3546 from zica87/patch-1

Replace RLS with rust-analyzer in ch00

Author: chriskrycho

src/ch00-00-introduction.md

@@ -38,7 +38,7 @@ Rust also brings contemporary developer tools to the systems programming world:
   ecosystem.
 * The Rustfmt formatting tool ensures a consistent coding style across
   developers.
-* The Rust Language Server powers Integrated Development Environment (IDE)
+* The rust-analyzer powers Integrated Development Environment (IDE)
   integration for code completion and inline error messages.
 
 By using these and other tools in the Rust ecosystem, developers can be