Apply suggestions from code review

Co-authored-by: Pooya Parsa <pooya_parsa_dadashi@yahoo.com>

Author: paulbalandan

user_guide_src/source/guides/api/controller.rst

@@ -77,7 +77,7 @@ In your BookModel, we add a new method called ``withAuthorInfo()``. This method
 
 
 Test the list endpoint
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+-----------------------
 
 Start the local server:
 

user_guide_src/source/guides/api/first-endpoint.rst

@@ -10,7 +10,7 @@ Auto Routing & Your First Endpoint
 In this section, we enable CodeIgniter's *Improved Auto Routing* feature and create a simple JSON endpoint to confirm everything is wired correctly.
 
 Why Auto-Routing?
-==================
+=============
 
 The previous tutorial showed how to define routes manually in **app/Config/Routes.php**. While powerful and flexible, this can be tedious for RESTful APIs with many endpoints that follow a common pattern. Auto-Routing simplifies this by mapping URL patterns to controller classes and methods based on conventions, and its focus on HTTP verbs works well for RESTful APIs.