(minor) Update multi-declarations.md
(minor) Update multi-declarations.md

(minor) Add a line stating that `componentN()` is not called for skipped  components
JetBrains/kotlin-web-site,meilalina/kotlin-web-site,meilalina/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,meilalina/kotlin-web-site,meilalina/kotlin-web-site,madvirus/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,madvirus/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,madvirus/kotlin-web-site