Updated local-block-value-boost in documentation to say 10 as default

docs/the_nimbus_book/src/options.md

@@ -137,7 +137,7 @@ The following options are available:
      --payload-builder         Enable external payload builder [=false].
      --payload-builder-url     Payload builder URL.
      --local-block-value-boost  Increase execution layer block values for builder bid comparison by a percentage
-                               [=0].
+                               [=10].
      --history                 Retention strategy for historical data (archive/prune) [=HistoryMode.Prune].
 
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