Fixed incorrect instrument.mjs filename (#12454)

Author: YuriyBl

docs/platforms/javascript/guides/aws-lambda/install/esm-npm.mdx

@@ -139,7 +139,7 @@ export const handler = Sentry.wrapHandler(async (event, context) => {
 
 ### 4. Load the SDK
 
-To load the SDK before your function starts, you need to preload the `instrumentation.mjs` by setting the `NODE_OPTIONS` environment variable:
+To load the SDK before your function starts, you need to preload the `instrument.mjs` by setting the `NODE_OPTIONS` environment variable:
 
 ```bash
 NODE_OPTIONS="--import instrument.mjs"