fix: Key case to match to existing code

Signed-off-by: Adam Harvey <adaharve@cisco.com>

plugins/pagerduty/README.md

@@ -181,7 +181,7 @@ _Note: When annotating with `pagerduty.com/service-id`, the feature to Create In
 If you want to override the default URL used for events, you can add it to `app-config.yaml`:
 
 ```yaml
-pagerduty:
+pagerDuty:
   eventsBaseUrl: 'https://events.pagerduty.com/v2'
 ```
 

plugins/pagerduty/config.d.ts

@@ -18,7 +18,7 @@ export interface Config {
    * Configuration for the PagerDuty plugin
    * @visibility frontend
    */
-  pagerduty?: {
+  pagerDuty?: {
     /**
      * Optional Events Base URL to override the default.
      * @visibility frontend