message: Update with suggestion
diff: @@ -18,7 +18,7 @@ with another** to express strategies such as:
  Cargo has a core assumption about source replacement that the source code is
  exactly the same from both sources. Note that this also means that
  a replacement source is not allowed to have crates which are not present in the
  -default crates.io source.
  +original source.
  As a consequence, source replacement is not appropriate for situations such as
  patching a dependency or a private registry. Cargo supports patching
  