docs: make processor ID variable consistent with comments in snippet (#…

…136)

Co-authored-by: Benjamin E. Coe <bencoe@google.com>

document-ai/process-document.v1beta3.js

@@ -22,7 +22,7 @@ async function main(projectId, location, processorId, filePath) {
    */
   // const projectId = 'YOUR_PROJECT_ID';
   // const location = 'YOUR_PROJECT_LOCATION'; // Format is 'us' or 'eu'
-  // const processor = 'YOUR_PROCESSOR_ID'; // Create processor in Cloud Console
+  // const processorId = 'YOUR_PROCESSOR_ID'; // Create processor in Cloud Console
   // const filePath = '/path/to/local/pdf';
 
   const {