fix(docs): remove \n for frontmatter

Author: zoobestik

docs/topics/kotlin-language-features-and-proposals.md

@@ -1,6 +1,5 @@
 [//]: # (title: Kotlin language features and proposals)
-[//]: # (description: Learn about the lifecycle of Kotlin features. 
-The page contains the full list of Kotlin language features and design proposals.)
+[//]: # (description: Learn about the lifecycle of Kotlin features. The page contains the full list of Kotlin language features and design proposals.)
 
 JetBrains evolves the Kotlin language according to the [Kotlin language evolution principles](kotlin-evolution-principles.md),
 guided by pragmatic design.
@@ -437,4 +436,4 @@ guided by pragmatic design.
 <include element-id="source" use-filter="empty,revoked" from="kotlin-language-features-and-proposals.md"/>
 
 </tab>
-</tabs>
+</tabs>