Fix typo

Author: dpyzo0o

5-network/03-fetch-progress/article.md

@@ -107,6 +107,6 @@ Let's explain that step-by-step:
     let blob = new Blob(chunks);
     ```
 
-At we end we have the result (as a string or a blob, whatever is convenient), and progress-tracking in the process.
+At the end we have the result (as a string or a blob, whatever is convenient), and progress-tracking in the process.
 
 Once again, please note, that's not for *upload* progress (no way now with `fetch`), only for *download* progress.

5-network/09-resume-upload/article.md

@@ -44,7 +44,7 @@ To resume upload, we need to know *exactly* the number of bytes received by the
 
     This assumes that the server tracks file uploads by `X-File-Id` header. Should be implemented at server-side.
 
-    If the file don't yet exist at the server, then the server response should be `0`
+    If the file doesn't yet exist at the server, then the server response should be `0`
 
 3. Then, we can use `Blob` method `slice` to send the file from `startByte`:
     ```js