docs: update casing of to (#430)

Co-authored-by: mwbrooks <[email protected]>

Author: slackapi[bot]

docs/additional-configurations.md

@@ -40,7 +40,7 @@ Reference to the flattening implementation is available for exploration from wit
 
 ## Parsing templated variables
 
-Additional variables provided in the  event [context](https://.com/actions/toolkit/blob/main/packages//src/context.ts#L6) and event [payload](https://docs..com/en/webhooks/webhook-events-and-payloads) can be used to replace templated variables in the input payload with the `payload-templated` option:
+Additional variables provided in the  event [context](https://.com/actions/toolkit/blob/main/packages//src/context.ts#L6) and event [payload](https://docs..com/en/webhooks/webhook-events-and-payloads) can be used to replace templated variables in the input payload with the `payload-templated` option:
 
 ```yaml
 - name: Send custom JSON data to Slack workflow
@@ -113,4 +113,4 @@ In certain circumstances, such as testing the sent payload, a [custom API URL](h
 text: "What's happening on localhost?"
 ```
 
-The default value of `api` is `https://slack.com/api/` for steps using `method`.
+The default value of `api` is `https://slack.com/api/` for steps using `method`.