Clean up redundant relative links in "C++ Standard Library Reference" article

Author: Rageking8

docs/standard-library/cpp-standard-library-reference.md

@@ -18,11 +18,11 @@ From a historical perspective, "STL" originally referred to the Standard Templat
 
 ## In this section
 
-[C++ Standard Library overview](../standard-library/cpp-standard-library-overview.md)\
+[C++ Standard Library overview](cpp-standard-library-overview.md)\
 Provides an overview of the Microsoft implementation of the C++ Standard Library.
 
-[`iostream` programming](../standard-library/iostream-programming.md)\
+[`iostream` programming](iostream-programming.md)\
 Provides an overview of `iostream` programming.
 
-[Header files reference](../standard-library/cpp-standard-library-header-files.md)\
+[Header files reference](cpp-standard-library-header-files.md)\
 Provides links to reference topics about the C++ Standard Library header files, with code examples.