Fix typos and formatting bugs

- Fix subject-verb agreement: "prevent" -> "prevents" in how_it_all_works.md
- Remove extra leading space before code fence in popups.md

https://claude.ai/code/session_018JmHArukYvJMFMMLx1s2G5

Author: claude

docs/development/popups.md

@@ -86,7 +86,7 @@ If you need to manage a stack of multiple popups, remember that abap2UI5 display
 
 ### Popover
 To display a popover, use the method `client->popover_display` and specify the ID of the control where you want the popover to appear:
- ```abap
+```abap
   METHOD z2ui5_if_app~main.
 
     IF client->check_on_init( ).

docs/technical/how_it_all_works.md

@@ -272,7 +272,7 @@ In the current approach, they are separated from the view and created using addi
 
 Actual Approach - extra methods for the event and binding
 
-This is a difference from many other UI rendering processes, where data and UI are usually imported together. Separating them here simplifies the view creation process, avoids data redundancies, and prevent the framework from becoming messy. The current approach has fewer lines of code than the first approach that only focused on selection screens, because the entire view creation process is clearly separated from the rest now and kept outside of the framework.
+This is a difference from many other UI rendering processes, where data and UI are usually imported together. Separating them here simplifies the view creation process, avoids data redundancies, and prevents the framework from becoming messy. The current approach has fewer lines of code than the first approach that only focused on selection screens, because the entire view creation process is clearly separated from the rest now and kept outside of the framework.
 
 ##### 22. "Over the Wire" sending JS, HTML & CSS