Fix docs: use documenter=false for ETACE LAMMPS tutorial

The `execute=false` only affects Literate.jl but Documenter.jl still
tries to execute @example blocks. Using `documenter=false` generates
plain code blocks that are shown but not executed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jameskermode

docs/make.jl

@@ -37,11 +37,11 @@ Literate.markdown(_examples_src * "/etace_tutorial.jl",
                   _tutorial_out; documenter = true)
 
 # LAMMPS export tutorial lives in export/examples/
-# Use execute=false because this tutorial runs full model fitting (slow)
-# and requires packages not in docs environment (Unitful)
+# Use documenter=false to generate plain code blocks (not @example blocks)
+# because this tutorial runs full model fitting and requires Unitful
 _export_examples = joinpath(@__DIR__(), "..", "export", "examples")
 Literate.markdown(_export_examples * "/etace_lammps_tutorial.jl",
-                  _tutorial_out; documenter = true, execute = false)
+                  _tutorial_out; documenter = false)
 
 # Literate.markdown(_tutorial_src * "/first_example_model.jl", 
 #                   _tutorial_out; documenter = true)