Improve Documentation (#433)

- document more assumptions about usage context of gitea
- improve some flag descriptions (#432, #377)

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/433
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

cmd/releases/create.go

@@ -27,11 +27,11 @@ var CmdReleaseCreate = cli.Command{
 	Flags: append([]cli.Flag{
 		&cli.StringFlag{
 			Name:  "tag",
-			Usage: "Tag name",
+			Usage: "Tag name. If the tag does not exist yet, it will be created by Gitea",
 		},
 		&cli.StringFlag{
 			Name:  "target",
-			Usage: "Target refs, branch name or commit id",
+			Usage: "Target branch name or commit hash. Defaults to the default branch of the repo",
 		},
 		&cli.StringFlag{
 			Name:    "title",
@@ -56,7 +56,7 @@ var CmdReleaseCreate = cli.Command{
 		&cli.StringSliceFlag{
 			Name:    "asset",
 			Aliases: []string{"a"},
-			Usage:   "List of files to attach",
+			Usage:   "Path to file attachment. Can be specified multiple times",
 		},
 	}, flags.AllDefaultFlags...),
 }