clarify in the docs that execute=true cd to outputdir

docs/src/outputformats.md

@@ -79,8 +79,10 @@ Out[3]: │ 11/15
 
 We note that lines starting with `#'` is put in markdown cells,
 and the code lines have been put in code cells. By default the notebook
-is also executed and output cells populated. Some of the output rendering
+is also executed and output cells populated. The current working directory
-can be controlled with keyword arguments to [`Literate.notebook`](@ref):
+is set to the specified output directory the notebook is executed.
+Some of the output rendering can be controlled with keyword
+arguments to [`Literate.notebook`](@ref):
 
 ```@docs
 Literate.notebook

src/Literate.jl

@@ -350,7 +350,8 @@ Keyword arguments:
   see the [Custom pre- and post-processing](@ref Custom-pre-and-post-processing)
   section of the manual. Defaults to `identity`.
 - `execute`: a boolean deciding if the generated notebook should also
-  be executed or not. Defaults to `true`.
+  be executed or not. Defaults to `true`. The current working directory
+  is set to `outputdir` when executing the notebook.
 - `documenter`: boolean that says if the source contains Documenter.jl specific things
   to filter out during notebook generation. Defaults to `true`. See the the manual
   section on [Interaction with Documenter](@ref Interaction-with-Documenter).