OWNER_ALIAS: Extend some scoping

Signed-off-by: Fabian Deutsch <[email protected]>

OWNERS_ALIASES

@@ -61,6 +61,7 @@ aliases:
 
   #
   # SIG Network
+  # Owns anything related to networking.
   #
   sig-network-reviewers:
       - AlonaKaplan
@@ -77,6 +78,7 @@ aliases:
 
   #
   # SIG Scale
+  # Owns to keep kubevirt's scalability comparable to Kubernetes'.
   #
   sig-scale-approvers:
       - rthallisey
@@ -85,48 +87,69 @@ aliases:
 
   #
   # SIG Storage
+  # Owns anything related to storage.
   #
   sig-storage-approvers: {}
   sig-storage-reviewers: {}
 
   #
   # SIG API
+  # Owns the API including API life-cycle, deprecation,
+  # and backwards compatibility.
   #
   sig-api-approvers: {}
   sig-api-reviewers: {}
 
   #
   # SIG Controllers
+  # Owns the knowledge about excellent controllers in kubevirt.
   #
   sig-controllers-approvers: {}
   sig-controllers-reviewers: {}
 
   #
   # SIG Live Migration
+  # Owns the orchestration of live migrations, besides this keeping
+  # other teams honest to make sure that their features work well
+  # with Live Migration.
   #
   sig-live-migration-approvers: {}
   sig-live-migration-reviewers: {}
 
   #
   # SIG Node
+  # Owns everything which is taking place on a node, for example
+  # (but not limited to) groups, SELinux, node labels, …
   #
   sig-node-approvers: {}
   sig-node-reviewers: {}
 
   #
   # SIG Observability
+  # Owns the responsibility to keep kubevirt observable by i.e.
+  # having mertics, alters, and runbooks.
   #
   sig-observability-approvers: {}
   sig-observability-reviewers: {}
 
   #
   # SIG Release
+  # Owns the release process, including the schedule, and tools.
   #
   sig-release-approvers: {}
   sig-release-reviewers: {}
 
   #
   # SIG Buildsystem
+  # Owns bazel, and ensures that kubevirt can be build.
   #
   sig-buildsystem-approvers: {}
   sig-buildsystem-reviewers: {}
+
+  #
+  # SIG Architecture
+  # Owns the overall architecture, and supporting the growth, health,
+  # openess of KubeVirt.
+  #
+  sig-architecture-approvers: {}
+  sig-architecture-reviewers: {}