Fix pronoun consistency

Throughout the course, we as a pronoun has been used exclusively. I figured to be consistent, changing I'll to we will would align with the rest of the courses tonality.

Author: Dezzep

src/content/6/en/part6d.md

@@ -153,7 +153,7 @@ The current code for the application is in [GitHub](https://github.com/fullstack
 
 ### Synchronizing data to the server using React Query
 
-Data is already successfully retrieved from the server. Next, I'll make sure that the added and modified data is stored on the server. Let's start by adding new notes.
+Data is already successfully retrieved from the server. Next, we will make sure that the added and modified data is stored on the server. Let's start by adding new notes.
 
 Let's make a function <i>addANote</i> to the file <i>requests.js</i> for saving new notes: