Fix part9.md's - more corrections of the same grammar occurence

Author: SzymSie

src/content/6/en/part6e.md

@@ -7,7 +7,7 @@ lang: en
 
 <div class="tasks">
 
-**NOTE**: this is the old ending section of the 6 part that has 30th January 2023 been replaced with material about [React Query, useReducer and context](/en/part6/react_query_use_reducer_and_the_context). This section remains here for couple of weeks.
+**NOTE**: this is the old ending section of the 6 part that has 30th January 2023 been replaced with material about [React Query, useReducer and context](/en/part6/react_query_use_reducer_and_the_context). This section remains here for a couple of weeks.
 
 If you have started with the exercises (6.19-6.21) that use the Redux connect you may continue with those. If you have not yet started, I recommend to proceed with the new section.
 </div>
@@ -602,7 +602,7 @@ More about this [here](https://www.simplethread.com/cant-replace-redux-with-hook
 
 ### Exercises 6.19.-6.21.
 
-**NOTE**: this is the old ending section of the 6 part that has 30th January 2023 been replaced with material about [React Query, useReducer and context](/en/part6/react_query_use_reducer_and_the_contex). This section remains here for couple of weeks.
+**NOTE**: this is the old ending section of the 6 part that has 30th January 2023 been replaced with material about [React Query, useReducer and context](/en/part6/react_query_use_reducer_and_the_contex). This section remains here for a couple of weeks.
 
 If you have started with the exercises that use the Redux connect you may continue with those. If you have not yet started, I recommend to proceed with the new section.
 

src/content/9/en/part9f.md

@@ -9,7 +9,7 @@ lang: en
 
 **NOTE**: this is the old section about Patientor frontend that was replaced 12th February 2023, with [this chapter](/en/part9/grande_finale_patientor_frontend). In the change, the Patientor frontend structure was refactored to a simpler form that makes it much easier to focus on learning TypeScript. 
 
-If you have started doing the exercises with the old Patientor, you may continue with this section. If not, then it is recommended to use the "new" patientor. This section remains here for couple of weeks.
+If you have started doing the exercises with the old Patientor, you may continue with this section. If not, then it is recommended to use the "new" patientor. This section remains here for a couple of weeks.
 </div>
 
 <div class="content">