events: fix violation of symbol naming convention

Capital letter is followed after 'k' prefix.

PR-URL: #45978
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>

Author: deokjinkim

lib/internal/event_target.js

@@ -56,7 +56,7 @@ const kEvents = Symbol('kEvents');
 const kIsBeingDispatched = Symbol('kIsBeingDispatched');
 const kStop = Symbol('kStop');
 const kTarget = Symbol('kTarget');
-const kHandlers = Symbol('khandlers');
+const kHandlers = Symbol('kHandlers');
 const kWeakHandler = Symbol('kWeak');
 
 const kHybridDispatch = SymbolFor('nodejs.internal.kHybridDispatch');