thelio-r5-n1 (specs): Remove ref to non-existent M.2 NVMe Gen 3 slot

Author: thomas-zimmerman

src/content/docs/models/thelio-r5-n1/specs.md

@@ -61,7 +61,6 @@ The System76 Thelio is a desktop with the following specifications:
 - Storage
     - 1x M.2 (PCIe NVMe Gen 5) SSD
     - 1x M.2 (PCIe NVMe Gen 4) SSD
-    - 1x M.2 (PCIe NVMe Gen 3) SSD
     - 2x 2.5" SATA
 - USB
     - Back ports:
@@ -73,4 +72,4 @@ The System76 Thelio is a desktop with the following specifications:
         - 1x USB 3.2 Gen 1 Type-C
         - 1x USB 3.2 Gen 1 Type-A
 - Dimensions
-    - 32.7cm × 20.7cm × 29.1cm
+    - 32.7cm × 20.7cm × 29.1cm