rename HelpFormat constants

The previous constants did not follow the same naming convention as other exported enumerated types.

For example, type "FormState" uses the noun "Form" followed by attribute "State", while the constants of that type use the attribute followed by a unique description (e.g., "Normal" from identifier "StateNormal").

Also, the previous descriptions "Short" versus "Full" did not complement each other. These were updated to be antonyms so that someone can easily figure out an alternative from a known identifier.

examples/bubbletea/main.go

@@ -206,7 +206,7 @@ func (m Model) View() string {
 		}
 		body := lipgloss.JoinHorizontal(lipgloss.Top, form, status)
 
-		keys := m.form.KeyBindsHelp(huh.ShortHelp)
+		keys := m.form.KeyBindsHelp(huh.FormatShort)
 		footer := m.appBoundaryView(m.form.Help().ShortHelpView(keys))
 		if len(errors) > 0 {
 			footer = m.appErrorBoundaryView("")

form.go

@@ -151,11 +151,11 @@ type Field interface {
 type HelpFormat int
 
 const (
-	// FullHelp is the full-size help format.
-	FullHelp HelpFormat = iota
+	// FormatLong is the full-size default help format.
+	FormatLong HelpFormat = iota
 
-	// ShortHelp is the one-line summary help format.
-	ShortHelp
+	// FormatShort is the one-line summary help format.
+	FormatShort
 )
 
 // FieldPosition is positional information about the given field and form.

group.go

@@ -287,7 +287,7 @@ func (g *Group) View() string {
 	g.viewport.SetContent(fields.String() + "\n")
 
 	if g.showHelp && len(errors) <= 0 {
-		keys := g.fields[g.paginator.Page].KeyBindsHelp(ShortHelp)
+		keys := g.fields[g.paginator.Page].KeyBindsHelp(FormatShort)
 		view.WriteString(g.help.ShortHelpView(keys))
 	}