[BUGFIX] Fix async label in ext_conf_template

Author: wazum

ext_conf_template.txt

@@ -18,7 +18,7 @@ use_system_settings = 1
 hide_webp = 1
 # cat=basic; type=string; label=Pattern to filter out files
 filter_pattern = /\.(jpe?g|png|gif)\.(webp|avif|jxl)$/i
-# cat=async; type=boolean; label=Enable asynchronous conversion via tx_webp_queue + the webp:process-queue scheduler task (decouples conversion from page render)
+# cat=async; type=boolean; label=Enable asynchronous conversion via a scheduler task
 async = 0
 # cat=async; type=int+; label=Random sleep (ms) between conversions in the worker (0 = no sleep); each pause is randomized between half and 1.5x of this value
 async_throttle_ms = 0