improve documentation

Fix multiple typos in the internal documentation

Improve visual aspect and redaction

docs/dev/git-conventions.md

@@ -80,7 +80,8 @@ When you finished developing, you must compile, run linter and run all tests:
 
     cargo fmt
     cargo clippy
-    cd tests && npm test # FIXME
+    cargo tu
+    cargo cucumber
 
 Then commit everything.