doc: cleanup etcd/raft in all documents

TODO:
1. Update Documentation/contributor-guide/modules.svg;
2. Update bill-of-materials.json when raft and raftexample are removed in future;

Signed-off-by: Benjamin Wang <wachao@vmware.com>

Documentation/contributor-guide/modules.md

@@ -24,8 +24,9 @@ There are following modules:
   - **go.etcd.io/etcd/client/v2** - legacy client library used to contact etcd
   over HTTP protocol. Deprecated. All new usage should depend on /v3 library.
 
-  - **go.etcd.io/etcd/raft/v3** - implementation of distributed consensus
-  protocol. Should have no etcd specific code.
+  - **go.etcd.io/raft/v3** - implementation of distributed consensus
+  protocol. Should have no etcd specific code. Hosted in a separate repository:
+  https://github.com/etcd-io/raft.
 
   - **go.etcd.io/etcd/server/v3** - etcd implementation.
   The code in this package is etcd internal and should not be consumed

bill-of-materials.json

@@ -53,15 +53,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/certifi/gocertifi",
-		"licenses": [
-			{
-				"type": "Mozilla Public License 2.0",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "github.com/cespare/xxhash/v2",
 		"licenses": [
@@ -80,33 +71,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/cockroachdb/datadriven",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
-	{
-		"project": "github.com/cockroachdb/errors",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
-	{
-		"project": "github.com/cockroachdb/logtags",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "github.com/coreos/go-semver/semver",
 		"licenses": [
@@ -161,15 +125,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/getsentry/raven-go",
-		"licenses": [
-			{
-				"type": "BSD 3-clause \"New\" or \"Revised\" License",
-				"confidence": 0.9663865546218487
-			}
-		]
-	},
 	{
 		"project": "github.com/go-logr/logr",
 		"licenses": [
@@ -350,15 +305,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/pkg/errors",
-		"licenses": [
-			{
-				"type": "BSD 2-clause \"Simplified\" License",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "github.com/pmezard/go-difflib/difflib",
 		"licenses": [
@@ -584,6 +530,15 @@
 			}
 		]
 	},
+	{
+		"project": "go.etcd.io/raft/v3",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
+				"confidence": 1
+			}
+		]
+	},
 	{
 		"project": "go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc",
 		"licenses": [

codecov.yml

@@ -8,7 +8,6 @@ fixes:
   - "go.etcd.io/etcd/client/v2/::client/v2/"
   - "go.etcd.io/etcd/etcdctl/v3/::etcdctl/"
   - "go.etcd.io/etcd/pkg/v3/::pkg/"
-  - "go.etcd.io/etcd/raft/v3/::raft/"
   - "go.etcd.io/etcd/server/v3/::server/"
 
 ignore:

server/etcdserver/api/rafthttp/doc.go

@@ -12,5 +12,5 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package rafthttp implements HTTP transportation layer for etcd/raft pkg.
+// Package rafthttp implements HTTP transportation layer for raft pkg.
 package rafthttp