doc: use case-sensitive in the example

PR-URL: #35624
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/api/process.md

@@ -1887,7 +1887,7 @@ present.
 
 ```js
 const data = process.report.getReport();
-console.log(data.header.nodeJsVersion);
+console.log(data.header.nodejsVersion);
 
 // Similar to process.report.writeReport()
 const fs = require('fs');