Fixed a typo (#200)

content/asp.net/getting-started/middleware-basic.md

@@ -139,10 +139,10 @@ app.Use(async (context, next) =>
 ```
 
 > **Note** {.note}    
-> Avoid writing to Response headers in middleware if you're not certain that other middleware hasn't already begun writing to the response (in which case, the headers will already have been sent to the client). In particular, use caution when writing to the Response after having called other middleware (in the example above, aftet the ``await next();`` statement).
+> Avoid writing to Response headers in middleware if you're not certain that other middleware hasn't already begun writing to the response (in which case, the headers will already have been sent to the client). In particular, use caution when writing to the Response after having called other middleware (in the example above, after the ``await next();`` statement).
 
 ## Next Steps
 
 See if you can create another request endpoint to display a particular quotation. You can do this by using ``app.Map`` for a particular path, such as ``/quote``. Notice that within a mapped pipeline, the path segment used to match ``app.Map`` is removed from the ``Request.Path``. Thus, if you map ``/quote`` and want to pull the index of the quote from the full path of ``/quote/1``, you'll find that within your ``Map`` function the path is simply ``/1``.
 
-You can fetch a specific quotation by index using, for example, ``QuotationStore.Quotations[0]``.
+You can fetch a specific quotation by index using, for example, ``QuotationStore.Quotations[0]``.