Add a bit of extra spacing if group description is provided.

See #135.

help.go

@@ -148,10 +148,12 @@ func printNodeDetail(w *helpWriter, node *Node, hide bool) {
 		for _, group := range groupedFlags {
 			w.Print("")
 			if group.Metadata.Title != "" {
-				w.Print(group.Metadata.Title)
+				w.Wrap(group.Metadata.Title)
 			}
 			if group.Metadata.Description != "" {
-				w.Print(group.Metadata.Description)
+				w.Print("")
+				w.Wrap(group.Metadata.Description)
+				w.Print("")
 			}
 			writeFlags(w.Indent(), group.Flags)
 		}
@@ -168,10 +170,12 @@ func printNodeDetail(w *helpWriter, node *Node, hide bool) {
 			for _, group := range groupedCmds {
 				w.Print("")
 				if group.Metadata.Title != "" {
-					w.Print(group.Metadata.Title)
+					w.Wrap(group.Metadata.Title)
 				}
 				if group.Metadata.Description != "" {
-					w.Print(group.Metadata.Description)
+					w.Print("")
+					w.Wrap(group.Metadata.Description)
+					w.Print("")
 				}
 
 				if w.Compact {

help_test.go

@@ -323,7 +323,9 @@ Flags:
       --free-bool             A non grouped bool flag.
 
 Group title taken from the kong.ExplicitGroups option
+
 A group header
+
   --grouped-a-string=STRING    A string flag grouped in A.
   --grouped-a-bool             A bool flag grouped in A.
 
@@ -335,7 +337,9 @@ Commands:
     A non grouped subcommand.
 
 Group title taken from the kong.ExplicitGroups option
+
 A group header
+
   one thing <arg>
     subcommand thing
 
@@ -379,7 +383,9 @@ Flags:
       --a-free-string=STRING    A non grouped string flag.
 
 Group title taken from the kong.ExplicitGroups option
+
 A group header
+
   --grouped-a-string=STRING    A string flag grouped in A.
   --grouped-a-bool             A bool flag grouped in A.