clarifying case sensitivity in include order

cppguide.html

@@ -400,7 +400,8 @@ <h3 id="Names_and_Order_of_Includes">Names and Order of Includes</h3>
 C++ standard library headers,
 other libraries' headers, your project's
 headers.\b
-The includes should be ordered alphabetically. This ordering should be case-sensitive, meaningthat uppercase and lowercase letters are considered different</p>
+i
+The includes should be ordered alphabetically. This ordering should be case-sensitive, meaningthat uppercase and lowercase letters are considered to be different</p>
 
 <p>
 All of a project's header files should be