more README typo fixes, shell script execution flags

README.md

@@ -205,7 +205,7 @@ This is the version that all the "commands" example are using:
 ```
 The macro first declares the underlying C function, fills out the global variable initialization and inclues the C function, and then it sets up the signature of the function again, so that you can follow the macro with `{ ... }` the function block.
 ```C
-MY_COMMAND_DEFINE(Foo, "Do Foo.){
+MY_COMMAND_DEFINE(Foo, "Do Foo."){
  do_foo(ctx);
 }
 ```