Fix description of errnoRet in Seccomp

[z63d]

There is a subtle difference in syntax between Seccomp's defaultErrnoRet and errnoRet, so i will unify the syntax.

runtime-spec/config-linux.md

Line 722 in a5b0116

If not specified then its default value is `EPERM`.

runtime-spec/config-linux.md

Line 797 in a5b0116

If not specified its default value is `EPERM`.

Or you could just reference one of them like this...

runtime-spec/config-linux.md

Line 718 in a5b0116

* **`defaultAction`** *(string, REQUIRED)* - the default action for seccomp. Allowed values are the same as `syscalls[].action`.

[kolyshkin]

I would just say "The default is EPERM" in both cases.

Cc @cyphar

[giuseppe]

agreed. "The default is EPERM" should be enough

[kolyshkin]

@z63d PTAL

[z63d]

I just felt strange that there was only one difference in such a sentence.

the errno return code to use.
Some actions like SCMP_ACT_ERRNO and SCMP_ACT_TRACE allow to specify the errno code to return.
When the action doesn't support an errno, the runtime MUST print and error and fail.
If not specified then its default value is EPERM.

If there are no problems, close the PR.

[kolyshkin]

@z63d what I (and @giuseppe) meant is, can you please change the commit do just say "The default is EPERM" in both cases?

[z63d]

Ah, my understanding was lacking. Sorry.

[kolyshkin]

lgtm, thanks!