Clarify low_priority_query_wait_time_ms meaning

Author: nickitat

src/Core/Settings.cpp

@@ -6460,7 +6460,7 @@ Normally this setting should be set in user profile (users.xml or queries like `
 Note that initially (24.12) there was a server setting (`send_settings_to_client`), but latter it got replaced with this client setting, for better usability.
 )", 0)                                  \
     DECLARE(Milliseconds, low_priority_query_wait_time_ms, 1000, R"(
-Wait time in milliseconds when lower priority query meets higher priority query.
+When the query prioritization mechanism is employed (see setting `priority`), low-priority queries wait for higher-priority queries to finish. This setting specifies the duration of waiting.
 )", BETA) \
     DECLARE(Float, min_os_cpu_wait_time_ratio_to_throw, 2.0, "Min ratio between OS CPU wait (OSCPUWaitMicroseconds metric) and busy (OSCPUVirtualTimeMicroseconds metric) times to consider rejecting queries. Linear interpolation between min and max ratio is used to calculate the probability, the probability is 0 at this point.", 0) \
     DECLARE(Float, max_os_cpu_wait_time_ratio_to_throw, 6.0, "Max ratio between OS CPU wait (OSCPUWaitMicroseconds metric) and busy (OSCPUVirtualTimeMicroseconds metric) times to consider rejecting queries. Linear interpolation between min and max ratio is used to calculate the probability, the probability is 1 at this point.", 0) \