[Docs] Another round of stylistic fixes.

docs/linux_pid_namespace_support.md

-The [LinuxSUIDSandbox](LinuxSUIDSandbox.md) currently relies on support for the CLONE\_NEWPID flag in Linux's [clone() system call](http://www.kernel.org/doc/man-pages/online/pages/man2/clone.2.html).  You can check whether your system supports PID namespaces with the code below, which must be run as root:
+# Linux PID Namespace Support
 
-```
+The [LinuxSUIDSandbox](linux_suid_sandbox.md) currently relies on support for
+the `CLONE_NEWPID` flag in Linux's
+[clone() system call](http://www.kernel.org/doc/man-pages/online/pages/man2/clone.2.html).
+You can check whether your system supports PID namespaces with the code below,
+which must be run as root:
+
+```c
 #define _GNU_SOURCE
 #include <unistd.h>
 #include <sched.h>
 #include <stdio.h>
 #include <sys/wait.h>
 
 #if !defined(CLONE_NEWPID)
 #define CLONE_NEWPID 0x20000000
 #endif
 
@@ skipping 18 matching lines @@
   const pid_t child = clone(worker, stack + sizeof(stack), CLONE_NEWPID, NULL);
   if (child == -1) {
     perror("clone");
     fprintf(stderr, "Clone failed. PID namespaces ARE NOT supported\n");
   }
 
   waitpid(child, NULL, 0);
 
   return 0;
 }
-```
+```