Fix eltype in doctest

docs/src/manual/rewrite.md

@@ -71,7 +71,7 @@ If you want to match a variable number of subexpressions at once, you will need
 @rule(+(~~xs) => ~~xs)(x + y + z)
 
 # output
-3-element view(::Vector{Any}, 1:3) with eltype Any:
+3-element view(::Vector{SymbolicUtils.BasicSymbolic}, 1:3) with eltype SymbolicUtils.BasicSymbolic:
  z
  y
  x