docs(credential-providers): update fromNodeProviderChain.ts docblock (#6086)

Clarify documentation on how init properties are used in fromNodeProviderChain

Author: DavidSouther

packages/credential-providers/src/fromNodeProviderChain.ts

@@ -15,9 +15,15 @@ import type { AwsCredentialIdentityProvider } from "@smithy/types";
  * // const { fromNodeProviderChain } = require("@aws-sdk/credential-providers") // CommonJS import
  *
  * const credentialProvider = fromNodeProviderChain({
- *   //...any input of fromEnv(), fromSSO(), fromTokenFile(), fromIni(),
+ *   // init properties for fromEnv(), fromSSO(), fromTokenFile(), fromIni(),
  *   // fromProcess(), fromInstanceMetadata(), fromContainerMetadata()
  *
+ *   // For instance, to ignore the ini shared cache, change the credentials filepath for all
+ *   // providers, and set the sso start id:
+ *   ignoreCache: true,
+ *   filepath: "~/.config/aws/credentials",
+ *   ssoStartUrl: "https://d-abc123.awsapps.com/start"
+ *
  *   // Optional. Custom STS client configurations overriding the default ones.
  *   clientConfig: { region },
  *   // Optional. Custom STS client middleware plugin to modify the client default behavior.