Clarify to use pubkeys flag instead of fetch

docs/pages/validator-management/external-signer.md

@@ -8,7 +8,7 @@ Internet and appropriate firewall rules should be in place to restrict access on
 
 ## Configuration
 
-Lodestar provides [CLI options](./validator-cli.md#--externalsignerurl) to configure an external signer.
+Lodestar provides [CLI options](./validator-cli.md#--externalsignerurl) to connect an external signer.
 
 ```sh
 ./lodestar validator --externalSigner.url "http://localhost:9000" --externalSigner.fetch
@@ -20,4 +20,4 @@ by adding newly discovered public keys and removing no longer present public key
 By default, the list of public keys will be fetched from the external signer once per epoch (6.4 minutes). This interval can be configured by setting [`--externalSigner.fetchInterval`](./validator-cli.md#--externalsignerfetchinterval) flag which takes a number in milliseconds.
 
 Alternatively, if it is not desired to use all public keys imported on the external signer, it is also possible to explicitly specify a list of public keys to use
-by setting the [`--externalSigner.pubkeys`](./validator-cli.md#--externalsignerpubkeys) flag.
+by setting the [`--externalSigner.pubkeys`](./validator-cli.md#--externalsignerpubkeys) flag instead of [`--externalSigner.fetch`](./validator-cli.md#--externalsignerfetch).