fix description of deck sync, diff, and validate commands in upgrade …

…guide

src/deck/3.0-upgrade.md

@@ -82,10 +82,10 @@ It assumes that the paths have been correctly transformed, either via Kong migra
 
 `deck diff`, `deck validate` (with `--online` flag only), or `deck sync`
 : decK performs a check to ensure all regex routes are correctly prefixed.
-If not, the behavior depends on the control plane type:
-* Self-managed {{site.base_gateway}} 2.x (`_format_version: 1.1` or earlier): Prints an error and stops the operation.
-* Self-managed {{site.base_gateway}} 3.x (`_format_version: 3.0`): Prints a warning and goes ahead with the `diff`, `sync`, or `validate` operation as usual.
-* {{site.konnect_short_name}}: Prints a warning and goes ahead with the `diff`, `sync`, or `validate` operation as usual.
+The behavior of the command depends on the format version in the declarative configuration file:
+* `_format_version: 1.1` or earlier: Prints an error and stops the operation.
+* `_format_version: 3.0` with _incorrectly_ prefixed routes: Prints a warning and goes ahead with the `diff`, `sync`, or `validate` operation as usual.
+* `_format_version: 3.0` with _correctly_ prefixed routes: Goes ahead with the `diff`, `sync`, or `validate` operation as usual.
 
 `deck convert`
 : Includes `--from` and `--to` flags for converting state files between major versions.