docs(help): add see also for the help command

cmd/scw/testdata/test-all-usage-help-usage.golden

@@ -1,6 +1,6 @@
 🎲🎲🎲 EXIT CODE: 0 🎲🎲🎲
 🟥🟥🟥 STDERR️️ 🟥🟥🟥️
-Get help about how the CLI works
+Get help about how specific topics inside the CLI work
 
 USAGE:
   scw help <command>
@@ -18,4 +18,8 @@ GLOBAL FLAGS:
   -o, --output string    Output format: json or human, see 'scw help output' for more info (default "human")
   -p, --profile string   The config profile to use
 
+SEE ALSO:
+  # Print general help
+  scw --help
+
 Use "scw help [command] --help" for more information about a command.

internal/namespaces/help/custom.go

@@ -17,10 +17,16 @@ func GetCommands() *core.Commands {
 
 func helpRoot() *core.Command {
 	return &core.Command{
-		Short:                "Get help about how the CLI works",
+		Short:                "Get help about how specific topics inside the CLI work",
 		Namespace:            "help",
 		AllowAnonymousClient: true,
 		Groups:               []string{"utility"},
+		SeeAlsos: []*core.SeeAlso{
+			{
+				Short:   "Print general help",
+				Command: "scw --help",
+			},
+		},
 	}
 }