Reformat non-documentation hostnames

Outside of the hostnames previously fixed, I talked with @williammartin about what to do with the remaining references and the concern about the mixed format.

One suggestion for the error / test use case was to remove the extraneous text all together.

acceptance/testdata/repo/repo-rename-transfer-ownership.txtar

@@ -3,7 +3,7 @@ exec gh repo create $ORG/$SCRIPT_NAME-$RANDOM_STRING --add-readme --private
 
 # Attempt to rename the repo with a slash in the name
 ! exec gh repo rename $ORG/new-name --repo=$ORG/$SCRIPT_NAME-$RANDOM_STRING --yes
-stderr 'New repository name cannot contain \''/\'' character - to transfer a repository to a new owner, you must follow additional steps on <github.com>. For more information on transferring repository ownership, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.'
+stderr 'New repository name cannot contain \''/\'' character - to transfer a repository to a new owner, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.'
 
 # Defer repo deletion
-defer gh repo delete $ORG/$SCRIPT_NAME-$RANDOM_STRING --yes
+defer gh repo delete $ORG/$SCRIPT_NAME-$RANDOM_STRING --yes

pkg/cmd/auth/login/login.go

@@ -95,7 +95,7 @@ func NewCmdLogin(f *cmdutil.Factory, runF func(*LoginOptions) error) *cobra.Comm
 			# Start interactive setup
 			$ gh auth login
 
-			# Authenticate against <github.com> by reading the token from a file
+			# Authenticate against github.com by reading the token from a file
 			$ gh auth login --with-token < mytoken.txt
 
 			# Authenticate with specific host

pkg/cmd/repo/rename/rename.go

@@ -126,7 +126,7 @@ func renameRun(opts *RenameOptions) error {
 	}
 
 	if strings.Contains(newRepoName, "/") {
-		return fmt.Errorf("New repository name cannot contain '/' character - to transfer a repository to a new owner, you must follow additional steps on <github.com>. For more information on transferring repository ownership, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.")
+		return fmt.Errorf("New repository name cannot contain '/' character - to transfer a repository to a new owner, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.")
 	}
 
 	if opts.DoConfirm {

pkg/cmd/repo/rename/rename_test.go

@@ -227,7 +227,7 @@ func TestRenameRun(t *testing.T) {
 				newRepoSelector: "org/new-name",
 			},
 			wantErr: true,
-			errMsg:  "New repository name cannot contain '/' character - to transfer a repository to a new owner, you must follow additional steps on <github.com>. For more information on transferring repository ownership, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.",
+			errMsg:  "New repository name cannot contain '/' character - to transfer a repository to a new owner, see <https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository>.",
 		},
 	}