dev/building: Remove mention of Go 1.18

Author: calmh

dev/building.rst

@@ -51,9 +51,6 @@ Building (Unix)
 
 .. code-block:: bash
 
-    # This should output "go version go1.18" or higher.
-    $ go version
-
     # Pick a place for your Syncthing source.
     $ mkdir -p ~/dev
     $ cd ~/dev
@@ -79,9 +76,6 @@ Building (Windows)
 
 .. code-block:: batch
 
-    # This should output "go version go1.18" or higher.
-    > go version
-
     # Pick a place for your Syncthing source.
     > md "%USERPROFILE%\dev"
     > cd "%USERPROFILE%\dev"