minor doc updates

Author: MichaelMure

root.go

@@ -25,6 +25,8 @@ func NewRootCommand() *cobra.Command {
 		Short: "A migration tool for git-bug",
 		Long: `git-bug-migration is a tool to migrate git-bug data stored in git repository to a newer format when breaking 
 changes are made in git-bug.
+
+To migrate a repository, go to the corresponding repository and run "git-bug-migration".
 	
 	`,
 

version.go

@@ -27,7 +27,7 @@ func newVersionCommand() *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "version",
-		Short: "Create a new bug.",
+		Short: "Show git-bug-migration version information.",
 		Run: func(cmd *cobra.Command, args []string) {
 			env.out.Println(version())
 		},