chore: Fixed comment about transaction_tracer.transaction_threshold (#2258)

Author: jsumners-nr

lib/config/default.js

@@ -519,12 +519,12 @@ defaultConfig.definition = () => ({
       env: 'NEW_RELIC_TRACER_ENABLED'
     },
     /**
-     * The duration at below which the slow transaction tracer should collect a
-     * transaction trace. If set to 'apdex_f', the threshold will be set to
+     * Sets the time, in seconds, for a transaction to be considered slow.
+     * When a transaction exceeds this threshold, a transaction trace will be recorded. When set to 'apdex_f', the threshold will be set to
      * 4 * apdex_t, which with a default apdex_t value of 500 milliseconds will
      * be 2 seconds.
      *
-     * If a time is provided, it is set in seconds.
+     * If a number is provided, it is set in seconds.
      */
     transaction_threshold: {
       formatter: float,