docs: update routing guide to reference php spark serve and remove redundant subdomain port note

Author: gr8man

user_guide_src/source/incoming/routing.rst

@@ -481,7 +481,7 @@ It would not work under the main site at **example.com**.
     The ``hostname`` option is compared against the full ``HTTP_HOST`` value of the
     request, including the port when one is present. When your application is served
     on a non-standard port (for example ``localhost:8080``, behind Docker, or when
-    using ``spark server``), you must include the port in the ``hostname`` option for
+    using ``php spark serve``), you must include the port in the ``hostname`` option for
     the routes to match. For example, ``['hostname' => 'localhost:8080']`` matches only
     requests to ``localhost:8080``.
 
@@ -511,10 +511,6 @@ that does not have any subdomain present, this will not be matched:
     Most domains should work fine but some edge case ones, especially with a period in the domain itself (not used
     to separate suffixes or www) can potentially lead to false positives.
 
-.. note::
-
-    The ``subdomain`` option is also compared against the ``HTTP_HOST`` value, so when the application runs on a
-    non-standard port, the port must be included as well (for example ``sub.example.com:8080``).
 
 Offsetting the Matched Parameters
 =================================