Built-in documentation text width in Lighthouse book (#5394)

* Adjust width

* Commit changes

* Trigger Build

book/src/help_vc.md

@@ -222,4 +222,5 @@ OPTIONS:
 
         --web3-signer-max-idle-connections <COUNT>
             Maximum number of idle connections to maintain per web3signer host. Default is unlimited.
-```
+```
+<style> .content main {max-width:88%;} </style>