Update part0b.md

Author: ivansimunic

src/content/0/en/part0b.md

@@ -66,7 +66,7 @@ Because of the img tag, the browser does a second <i>HTTP request</i> to fetch t
 
 The request was made to the address <https://studies.cs.helsinki.fi/exampleapp/kuva.png> and its type is HTTP GET. The response headers tell us that the response size is 89350 bytes, and its [Content-type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type) is <i>image/png</i>, so it is a png image. The browser uses this information to render the image correctly to the screen.
 
-The chain of events caused by opening the page <https://studies.cs.helsinki.fi/exampleapp> on a browser form the following [sequence diagram](https://www.geeksforgeeks.org/unified-modeling-language-uml-sequence-diagrams/):
+The chain of events caused by opening the page <https://studies.cs.helsinki.fi/exampleapp> on a browser forms the following [sequence diagram](https://www.geeksforgeeks.org/unified-modeling-language-uml-sequence-diagrams/):
 
 ![Sequence diagram of the flow covered above](../../images/0/7m.png)