doc: Adjust code layout and rendering display.

README.md

@@ -8,9 +8,7 @@ Current implementation require you to define(override) all the event specific di
 >
 > However, it seems dynamic reflection is necessary for implementation, but C++ have no this feature therefore impossible to achieve.
 
-## basic usage
-
-```c++
+```cpp
 #include <event_transformer.h>
 #include <so_5/all.hpp>
 
@@ -18,8 +16,10 @@ struct AEvent
 {
   double speed; // parameter of event
 };
+
 struct BEvent
 {};
+
 /**
  * @brief
  * as an interface for fake module process
@@ -37,8 +37,7 @@ class So5_fake_module_process_ev : virtual public Fake_module_process_ev
   so_5::mbox_t target;
 
 public:
-  So5_fake_module_process_ev(so_5::mbox_t target_)
-    : target(target_)
+  So5_fake_module_process_ev(so_5::mbox_t target_) : target(target_)
   {
   }
 
@@ -55,8 +54,7 @@ public:
   }
 };
 
-void
-fake_module_process(Fake_module_process_ev* evt_li_ptr)
+void fake_module_process(Fake_module_process_ev* evt_li_ptr)
 {
   // ...
   dispatch(evt_li_ptr, a_ev);