docs: display rcConfig flag on CLI reference page (#7270)

* docs: display rcConfig flag on CLI reference page

* Update word list

.wordlist.txt

@@ -110,6 +110,7 @@ Vitalik
 Vitest
 Wagyu
 api
+args
 async
 backfill
 beaconcha
@@ -244,3 +245,4 @@ xRelayPubKey
 xcode
 yaml
 yamux
+yml

packages/cli/src/options/globalOptions.ts

@@ -10,6 +10,7 @@ type GlobalSingleArgs = {
   paramsFile?: string;
   preset: string;
   presetFile?: string;
+  rcConfig?: string;
 };
 
 export const defaultNetwork: NetworkName = "mainnet";
@@ -44,11 +45,16 @@ const globalSingleOptions: CliCommandOptions<GlobalSingleArgs> = {
     description: "Preset configuration file to override the active preset with custom values",
     type: "string",
   },
+
+  rcConfig: {
+    description: "RC file to supplement command line args, accepted formats: .yml, .yaml, .json",
+    type: "string",
+  },
 };
 
 export const rcConfigOption: [string, string, (configPath: string) => Record<string, unknown>] = [
   "rcConfig",
-  "RC file to supplement command line args, accepted formats: .yml, .yaml, .json",
+  globalSingleOptions.rcConfig.description as string,
   (configPath: string): Record<string, unknown> => readFile(configPath, ["json", "yml", "yaml"]),
 ];