Merge pull request opencontainers#640 from RobDolinMS/patch-20

[Runtime Linux] Add anchor tags for headings

Author: vbatts

runtime-linux.md

@@ -1,12 +1,12 @@
-# Linux Runtime
+# <a name="linuxRuntime" />Linux Runtime
 
-## File descriptors
+## <a name="runtimeLinuxFileDescriptors" />File descriptors
 
 By default, only the `stdin`, `stdout` and `stderr` file descriptors are kept open for the application by the runtime.
 The runtime MAY pass additional file descriptors to the application to support features such as [socket activation](http://0pointer.de/blog/projects/socket-activated-containers.html).
 Some of the file descriptors MAY be redirected to `/dev/null` even though they are open.
 
-## Dev symbolic links
+## <a name="runtimeLinuxDevSymbolicLinks" /> Dev symbolic links
 
 After the container has `/proc` mounted, the following standard symlinks MUST be setup within `/dev/` for the IO.