Logging: improve help message of LOG_PRINTK Kconfig option

Improve it so that:
- it mentions the important fact that it redirects `printk` messages
 to the logging subsystem
- it is consistent with the help messages of the other options in this
 file (i.e. it starts with "If enabled")

Signed-off-by: Ladislav Podivin <[email protected]>

Author: ladivin

subsys/logging/Kconfig.processing

@@ -9,7 +9,8 @@ config LOG_PRINTK
 	bool "Process printk messages"
 	default y if PRINTK && (!ZTEST || ZTEST_NEW_API)
 	help
-	  LOG_PRINTK messages are formatted in place and logged unconditionally.
+	  If enabled, printk messages are redirected to the logging subsystem.
+	  The messages are formatted in place and logged unconditionally.
 
 if LOG_MODE_DEFERRED && !LOG_FRONTEND_ONLY