Fix outdated links

The coding style to linux is now moved, I changed link to point to the new location.

docs/coding_guidelines.md

@@ -4,7 +4,7 @@ We are using Modern C++11. Smart pointers, Lambdas, and C++11 multithreading pri
 
 ## Quick Note
 
-The great thing about "standards" is that there are many to chose from: [ISO](https://isocpp.org/wiki/faq/coding-standards), [Sutter & Stroustrup](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md), [ROS](http://wiki.ros.org/CppStyleGuide), [LINUX](https://www.kernel.org/doc/Documentation/CodingStyle), [Google's](https://google.github.io/styleguide/cppguide.html), [Microsoft's](https://msdn.microsoft.com/en-us/library/888a6zcz.aspx), [CERN's](http://atlas-computing.web.cern.ch/atlas-computing/projects/qa/draft_guidelines.html), [GCC's](https://gcc.gnu.org/wiki/CppConventions), [ARM's](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0475c/CJAJAJCJ.html), [LLVM's](http://llvm.org/docs/CodingStandards.html) and probably 
+The great thing about "standards" is that there are many to chose from: [ISO](https://isocpp.org/wiki/faq/coding-standards), [Sutter & Stroustrup](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md), [ROS](http://wiki.ros.org/CppStyleGuide), [LINUX](https://www.kernel.org/doc/Documentation/process/coding-style.rst), [Google's](https://google.github.io/styleguide/cppguide.html), [Microsoft's](https://msdn.microsoft.com/en-us/library/888a6zcz.aspx), [CERN's](http://atlas-computing.web.cern.ch/atlas-computing/projects/qa/draft_guidelines.html), [GCC's](https://gcc.gnu.org/wiki/CppConventions), [ARM's](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0475c/CJAJAJCJ.html), [LLVM's](http://llvm.org/docs/CodingStandards.html) and probably 
 thousands of others. Unfortunately most of these can't even agree on something as basic as how to name a class or a constant. This is probably due to the fact that these standards often carry lots of  legacy issues due to supporting existing code bases. The intention behind this document is to create guidance that remains as close to ISO, Sutter & Stroustrup and ROS while resolving as many conflicts, disadvantages and inconsistencies as possible among them.