Update doc

Author: nicolasstucki

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -583,9 +583,8 @@ object Trees {
 
   /** A tree representing inlined code.
    *
-   *  @param  call      Info about the original call that was inlined
-   *                    Until PostTyper, this is the full call, afterwards only
-   *                    a reference to the toplevel class from which the call was inlined.
+   *  @param  call      Info about the original call that was inlined.
+   *                    Only a reference to the toplevel class from which the call was inlined.
    *  @param  bindings  Bindings for proxies to be used in the inlined code
    *  @param  expansion The inlined tree, minus bindings.
    *

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -460,11 +460,8 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(implicit ctx: Context) {
       //  - the call's position
       // in the call field of an Inlined node.
       // The trace has enough info to completely reconstruct positions.
-      // The minimization is done for two reasons:
-      //  1. To save space (calls might contain large inline arguments, which would otherwise
-      //     be duplicated
-      //  2. To enable correct pickling (calls can share symbols with the inlined code, which
-      //     would trigger an assertion when pickling).
+      // The minimization is done for the following reason:
+      //   * To save space (calls might contain large inline arguments, which would otherwise be duplicated
       val callTrace = Ident(call.symbol.topLevelClass.typeRef).withPos(call.pos)
 
       // Take care that only argument bindings go into `bindings`, since positions are