Prune CI unnecessary doc stack traces

The scaladoc TastyParser fails when generating documentation for some files.
Every time an error happens, the stack is unnecessarily printed. These
stack makes updating the community build harder and the stack traces
shadow the real errors.

Author: nicolasstucki

scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala

@@ -228,6 +228,6 @@ case class TastyParser(
     try Traverser.traverseTree(root)(Symbol.spliceOwner)
     catch case e: Throwable =>
       println(s"Problem parsing ${root.pos}, documentation may not be generated.")
-      e.printStackTrace()
+      // e.printStackTrace()
 
     docs.result()