Fix asyncify mistake in docs (emscripten-core#26627)

There's two methods with the same name - `fetch_v2`, I think the first
one was supposed to be called `fetch_v1`.

Edit: I also have fixed a spelling mistake in the word `included`.

Author: BoryaGames

site/source/docs/porting/asyncify.rst

@@ -168,7 +168,7 @@ Marking JS library functions as async
 
 If you mark a JS library function as async using the ``__async`` decorator then
 the compiler will take a care of all the details of using the ``Asyncify`` API
-for you.  The function will also automatically be incldued in
+for you.  The function will also automatically be included in
 :ref:`ASYNCIFY_IMPORTS`.  All you need to do is write normal async JS function
 (either using the explict ``async`` JS keyword or returning a ``Promise``
 object).  For example:
@@ -177,7 +177,7 @@ object).  For example:
 
    addToLibrary({
      fetch_v1__async: 'auto',
-     fetch_v2: async (url) => {
+     fetch_v1: async (url) => {
        const response = await fetch(UTF8ToString(url);
        const json_data = await response.json();
        return stringToNewUTF8(json_data);