Merge branch 'rh/server-name-doc' into 'next'

doc: give example server name

See merge request famedly/conduit!731

docs/configuration.md

@@ -26,7 +26,7 @@ The `global` section contains the following fields:
 | `address` | `string` | The address to bind to | `"127.0.0.1"` |
 | `port` | `integer` | The port to bind to | `8000` |
 | `tls` | `table` | See the [TLS configuration](#tls) | N/A |
-| `server_name`_*_ | `string` | The server name | N/A |
+| `server_name`_*_ | `string` | The server name (for example, `"matrix.example.com"`) | N/A |
 | `database_backend`_*_ | `string` | The database backend to use (`"rocksdb"` *recommended*, `"sqlite"`) | N/A |
 | `database_path`_*_ | `string` | The path to the database file/dir | N/A |
 | `db_cache_capacity_mb` | `float` | The cache capacity, in MB | `300.0` |