fix markdown

doc/server_side_auth.md

examples/cpp/README.md

examples/cpp/cpptutorial.md

examples/csharp/route_guide/README.md

examples/node/dynamic_codegen/route_guide/README.md

examples/node/static_codegen/route_guide/README.md

examples/objective-c/auth_sample/README.md

examples/objective-c/helloworld/README.md

examples/objective-c/route_guide/README.md

examples/php/route_guide/README.md

examples/ruby/errors_and_cancellation/README.md

examples/ruby/route_guide/README.md

tools/grift/README.md

tools/run_tests/README.md

vsprojects/README.md