docs(pr create): standard <user>:<branch> syntax

Standardize <user>:<branch> syntax wherever it is described in comments.

pkg/cmd/pr/create/create.go

@@ -599,7 +599,7 @@ func NewCreateContext(opts *CreateOptions) (*CreateContext, error) {
 		promptForHeadRepo = false
 		targetHeadBranch = opts.HeadBranch
 		// If the --head provided contains a colon, that means
-		// this is <owner>:<branch> syntax.
+		// this is <user>:<branch> syntax.
 		if idx := strings.IndexRune(opts.HeadBranch, ':'); idx >= 0 {
 			targetHeadRepoOwner = opts.HeadBranch[:idx]
 			targetHeadBranch = opts.HeadBranch[idx+1:]
@@ -636,7 +636,7 @@ func NewCreateContext(opts *CreateOptions) (*CreateContext, error) {
 		return nil, err
 	}
 
-	// If the --head provided contains <repo_name>:<branch>  syntax, we need to use
+	// If the --head provided contains <user>:<branch>  syntax, we need to use
 	// the provided owner instead of the owner of the base repository.
 	if targetHeadRepoOwner != "" {
 		prRefs.HeadRepo = ghrepo.New(targetHeadRepoOwner, prRefs.HeadRepo.RepoName())

pkg/cmd/pr/create/create_test.go

@@ -1547,7 +1547,7 @@ func Test_createRun(t *testing.T) {
 			expectedErrOut: "\nCreating pull request for monalisa:task1 into feature/feat2 in OWNER/REPO\n\n",
 		},
 		{
-			name: "--head contains <remote>:<branch> syntax",
+			name: "--head contains <user>:<branch> syntax",
 			httpStubs: func(reg *httpmock.Registry, t *testing.T) {
 				reg.Register(
 					httpmock.GraphQL(`mutation PullRequestCreate\b`),

pkg/cmd/pr/shared/finder.go

@@ -115,7 +115,7 @@ func (s *PullRequestRefs) HasHead() bool {
 
 // GetPRHeadLabel returns the string that the GitHub API uses to identify the PR. This is
 // either just the branch name or, if the PR is originating from a fork, the fork owner
-// and the branch name, like <owner>:<branch>.
+// and the branch name, like <user>:<branch>.
 func (s *PullRequestRefs) GetPRHeadLabel() string {
 	if ghrepo.IsSame(s.HeadRepo, s.BaseRepo) {
 		return s.BranchName