test doc format

doc/SW_archi.md

@@ -7,16 +7,17 @@ Alice->Bob: Hello Bob, how are you?
 Note right of Bob: Bob thinks
 Bob-->Alice: I am good thanks!
 ```
+
 ```flow
 st=>start: Start
 op=>operation: Your Operation
 cond=>condition: Yes or No?
 e=>end
-
 st->op->cond
 cond(yes)->e
 cond(no)->op
 ​```
+
 ```mermaid
 %% Example of sequence diagram
   sequenceDiagram