docs: lowercase preposition in title

kenjis · kenjis · commit b780c0da3761 · 2023-01-15T11:59:47.000+09:00
diff --git a/user_guide_src/source/concepts/http.rst b/user_guide_src/source/concepts/http.rst
@@ -1,5 +1,5 @@
 ##########################
-Working With HTTP Requests
+Working with HTTP Requests
 ##########################
 
 In order to get the most out of CodeIgniter, you need to have a basic understanding of how HTTP requests
