fix(docs): update TOC path and build config

- fix path in kr.tree: "components-stability-pre-1-4.md" to "components-stability-pre-1.4.md"
- update TeamCity BuildReferenceDocs to include docs/kr.tree

Author: zoobestik

.teamcity/builds/kotlinlang/buidTypes/BuildReferenceDocs.kt

@@ -30,6 +30,10 @@ object BuildReferenceDocs : BuildType({
     param("WH_PROJECT_NAME", "kotlin-reference")
   }
 
+  vcs { root(vcsRoots.KotlinLangOrg, """
+      docs/kr.tree
+  """.trimIndent()) }
+
   steps {
     script {
       name = "Fix paths"

docs/kr.tree

@@ -51,7 +51,7 @@
 		<toc-element toc-title="Language features and proposals" topic="kotlin-language-features-and-proposals.md"/>
 		<toc-element toc-title="Language evolution principles" accepts-web-file-names="kotlin-evolution.html" topic="kotlin-evolution-principles.md"/>
 		<toc-element topic="components-stability.md"/>
-		<toc-element hidden="true" topic="components-stability-pre-1-4.md"/>
+		<toc-element hidden="true" topic="components-stability-pre-1.4.md"/>
 		<toc-element accepts-web-file-names="plugin-releases.html" topic="releases.md"/>
 	</toc-element>
 	<toc-element toc-title="Basics">