docs: fix wrong description on ALSEnvoyProxyAccessLog

[zirain]

this seems wrong for a long time.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.59%. Comparing base (6c6633c) to head (5f31209). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4751 +/- ## ========================================== - Coverage 65.63% 65.59% -0.05% ========================================== Files 211 211 Lines 31984 31984 ========================================== - Hits 20994 20979 -15 - Misses 9751 9763 +12 - Partials 1239 1242 +3 ```

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