Update changelog for alias markdown rendering

Author: tommaisey

changelog.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 <!-- Add all new changes here. They will be moved under a version at release -->
+* `NEW` Render `@alias` value types with markdown instead of code blocks
 * `FIX` Incorrect inject-field message for extra table field in exact class
 * `CHG` Rename configuration option `Lua.diagnostics.disableScheme` to `Lua.diagnostics.validScheme` and improve its description. Now it enables diagnostics for Lua files that use the specified scheme.
 * `FIX` adds the `|lambda|` operator to the `Lua.runtime.nonstandardSymbol` configuration template, which allows the use of that option. Previously, support for it existed in the parser, but we could not actually use the option because it is not recognised in the configuration.