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Update settings.md

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docs/en/operations/settings/settings.md
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@ -473,7 +473,7 @@ The maximum number of query processing threads, excluding threads for retrieving
This parameter applies to threads that perform the same stages of the query processing pipeline in parallel.
For example, when reading from a table, if it is possible to evaluate expressions with functions, filter with WHERE and pre-aggregate for GROUP BY in parallel using at least 'max_threads' number of threads, then 'max_threads' are used.
Default value: half the number of physical CPU cores.
Default value: the number of physical CPU cores.
If less than one SELECT query is normally run on a server at a time, set this parameter to a value slightly less than the actual number of processor cores.