Fix typo of README.md

Author: forward-jt

tinync/README.md

@@ -5,12 +5,11 @@ Tinync is a simplified version of [nc](https://en.wikipedia.org/wiki/Netcat), wh
 ### Declaring a Coroutine Function
 At the very beginning, a coroutine function should be declared first, coroutine function is part of program that will be executed simultaneously with other coroutines. All coroutines should be specified with the macro `cr_proto`, following shows the example:
 ```cpp
-static void cr_proto(coroutine_name, int x, float y)
+static void cr_proto(coroutine_name, parameter_declarations)
 {
     /* coroutine body */
 }
 ```
-Programmers are free to modify the argument list as they need.
 
 ### Controlling Macros
 With in the coroutine, there are several macros for controlling the behavior of coroutine, following are list of them:
@@ -20,14 +19,15 @@ With in the coroutine, there are several macros for controlling the behavior of
 * `cr_exit` not only yields a coroutine but also updates its state with given state.
 * `cr_sys` is a wrapper of `cr_wait` which performs waiting on system calls and other functions that return -1 and set `errno`.
 * `cr_local` is a marker for programmers to recognize a variable related to coroutine easily.
+
 In `tinync.c`, we can see the combinations of these macros:
 ```cpp
 static void cr_proto(stdin_loop, byte_queue_t *out)
 {
     /* b and r are variables used in coroutine whose
      * value will be preserved across pauses.
      */
-    cr_local uint9_t b;
+    cr_local uint8_t b;
     cr_local int r;
 
     cr_begin(); // Initiates the context of this coroutine.