docs(development): Add back default preview url

Author: tony

docs/developing.md

@@ -19,6 +19,8 @@ Rerun tests on file change: `make watch_test` (requires [entr(1)])
 
 ## Documentation
 
+Default preview server: http://localhost:8022
+
 [sphinx-autobuild] will automatically build the docs, watch for file changes and launch a server.
 
 From home directory: `make start_docs`
@@ -28,8 +30,6 @@ From inside `docs/`: `make start`
 
 ### Manual documentation (the hard way)
 
-Default preview server: http://localhost:8022
-
 `cd docs/` and `make html` to build. `make serve` to start http server.
 
 Helpers: