Add C and bash syntax highlighting

doc/Seccomp.md

@@ -15,21 +15,27 @@ a log message like the following:
 This number (`232` in the example) is specific to your system and you need to
 run a command to convert it to a syscall name.
 
-        echo '#include <sys/syscall.h>' | cpp -dM | grep '#define __NR_.* 232'
+```bash
+echo '#include <sys/syscall.h>' | cpp -dM | grep '#define __NR_.* 232'
+```
 
 Obviously you'll be replacing `232` with the actual syscall number which your system
 printed. The Result might look something like the following:
 
-        #define __NR_epoll_wait 232
+```c
+#define __NR_epoll_wait 232
+```
 
 Which would tell you (for example) that the `epoll_wait` syscall was disallowed on
 your system. In this case you'd need to go to `util/Seccomp.c` and inside of the
 `mkfilter()` function where the actual SECCOMP rules are set up, you'll see a set
 of entries such as the following.
 
-        #ifdef __NR_mmap2
-            IFEQ(__NR_mmap2, success),
-        #endif
+```c
+#ifdef __NR_mmap2
+    IFEQ(__NR_mmap2, success),
+#endif
+```
 
 Add a similar entry for the syscall (make sure you put it with the others and not)
 below the `RET(SECCOMP_RET_TRAP),` line which triggers the failure). When you have