include: Update krun_start_enter comment for nitro

The behavior of krun_start_enter differs a bit in libkrun-nitro, instead
returning the enclave CID rather than KRUN_SUCCESS.

Signed-off-by: Tyler Fanelli <[email protected]>

Author: tylerfanelli

include/libkrun.h

@@ -771,6 +771,9 @@ int32_t krun_nitro_set_start_flags(uint32_t ctx_id, uint64_t start_flags);
  *  code once the microVM shuts down. If an error occurred before running the workload the process
  *  will exit() with an error exit code.
  *
+ *  In the nitro flavor, this function always returns. Upon success, this function will return the
+ *  CID of the nitro enclave that was started.
+ *
  * Error exit codes:
  *  125     - "init" cannot set up the environment inside the microVM.
  *  126     - "init" can find the executable to be run inside the microVM but cannot execute it.