Update sbom.cdx.json

Co-authored-by: Steven Bellock <[email protected]>

Author: hughsie

sbom.cdx.json

@@ -16,7 +16,7 @@
       "cpe": "cpe:2.3:a:DMTF:libspdm:@VCS_TAG@:*:*:*:*:*:*:*",
       "name": "libspdm",
       "version": "@VCS_VERSION@",
-      "description": "Sample implementation of DMTF SPDM",
+      "description": "Reference implementation of SPDM",
       "supplier": {
         "name": "DMTF"
       },