issue #97: route grouping

Signed-off-by: horea <horea@rospace.com>

Author: Howriq

docs/book/v6/extended-features/route-grouping.md

@@ -22,6 +22,7 @@ $routeCollector->group('/user/' . $uuid)
 ```
 
 The advantages of this new implementation:
+
 - DRY - no need for repeating common route parts
 - encapsulation - similar routes are grouped in a single block of code (vs each route a separate statement)
 - easy path refactoring - modify all routes at once by changing only the prefix