First time on Kotlin and intellij. Can anyone tell me why some of my function names in intellij have...

# getting-started

[Rishav Sharan]

First time on Kotlin and intellij. Can anyone tell me why some of my function names in intellij have a strikethrough them?
Here the init name has a strikethrough

[Shawn]

struck-through names are deprecated (marked with @Deprecated) at the declaration site

[Shawn]

ctrl/cmd+b while your editing caret is on the symbol to go to the declaration, or hit F1 to get the documentation popover

[Rishav Sharan]

Thanks!