criu: change the comment about magic numbers

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (82bfb67) 70.67% compared to head (505628a) 70.55%. Report is 16 commits behind head on criu-dev.

:exclamation: Current head 505628a differs from pull request most recent head f730bbe. Consider uploading reports for the commit f730bbe to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## criu-dev #2275 +/- ## ============================================ - Coverage 70.67% 70.55% -0.13% ============================================ Files 133 132 -1 Lines 33330 33508 +178 ============================================ + Hits 23556 23641 +85 - Misses 9774 9867 +93 ``` | [Files](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore) | Coverage Δ | | |---|---|---| | [criu/include/parasite.h](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore#diff-Y3JpdS9pbmNsdWRlL3BhcmFzaXRlLmg=) | `100.00% <ø> (ø)` | | | [criu/include/vma.h](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore#diff-Y3JpdS9pbmNsdWRlL3ZtYS5o) | `100.00% <100.00%> (ø)` | | | [criu/parasite-syscall.c](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore#diff-Y3JpdS9wYXJhc2l0ZS1zeXNjYWxsLmM=) | `86.06% <100.00%> (+0.04%)` | :arrow_up: | | [criu/kerndat.c](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore#diff-Y3JpdS9rZXJuZGF0LmM=) | `57.83% <62.50%> (ø)` | | ... and [17 files with indirect coverage changes](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2275/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=checkpoint-restore)

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[avagin]

Applied. Thanks!