Update tutorial_developer_workflows.rst

Co-authored-by: Greg Becker <becker33@llnl.gov>

Author: psakievich

tutorial_developer_workflows.rst

@@ -153,7 +153,7 @@ The mechanics of how this section is used to enforce develpoment are as follows:
 2. Any specs selected in step 1 receive a ``dev_path=`` variant.
    This variant tells Spack where to find the source code for the spec.
 3. Calls to ``spack install`` will now use the source code at ``dev_path`` when building that package.
-   Spack doesn't clean this build up after a successful build so subsequent calls to ``spack install`` trigger incremental builds.
+4. Spack doesn't clean this build up after a successful build so subsequent calls to ``spack install`` trigger incremental builds.
 
 If the environment is already concretized ``spack develop`` performs step 1 and 2 insitu and updates the ``spack.lock`` file unless the ``--no-modify-concrete-specs`` option is passed.
 If ``--no-modify-concrete-specs`` is passed, the environment is not yet concretized, or needs to be futher changed to satisfy the develop specs (i.e. change version of the package) then selection of develop specs and assignment of ``dev_path`` are handled by the concretizer.