Improve documentation for use with Google Cloud Logging

Based on the documentation `messageKey` can only be configured in the main config and is not a valid configuration option for a formater. See formaters documentation: https://getpino.io/#/docs/api?id=formatters-object
pinojs · Mar 6, 2024 · e119259 · e119259
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commit e119259
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diff --git a/docs/help.md b/docs/help.md
@@ -244,7 +244,6 @@ const PinoLevelToSeverityLookup = {
 const defaultPinoConf = {
   messageKey: 'message',
   formatters: {
-    messageKey: 'message',
     level(label, number) {
       return {
         severity: PinoLevelToSeverityLookup[label] || PinoLevelToSeverityLookup['info'],