Fix confusing file name in generated diagnostics file (microsoft#46821)

* Fix confusing file name in generated diagnostics file

* Change "by" to "in"

Author: blaumeise20

scripts/processDiagnosticMessages.ts

@@ -41,7 +41,7 @@ function main(): void {
     const outputFilesDir = path.dirname(inputFilePath);
     const thisFilePathRel = path.relative(process.cwd(), outputFilesDir);
 
-    const infoFileOutput = buildInfoFileOutput(diagnosticMessages, "./diagnosticInformationMap.generated.ts", thisFilePathRel);
+    const infoFileOutput = buildInfoFileOutput(diagnosticMessages, `./${path.basename(inputFilePath)}`, thisFilePathRel);
     checkForUniqueCodes(diagnosticMessages);
     writeFile("diagnosticInformationMap.generated.ts", infoFileOutput);
 
@@ -62,7 +62,7 @@ function checkForUniqueCodes(diagnosticTable: InputDiagnosticMessageTable) {
 function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, inputFilePathRel: string, thisFilePathRel: string): string {
     let result =
         "// <auto-generated />\r\n" +
-        "// generated from '" + inputFilePathRel + "' by '" + thisFilePathRel.replace(/\\/g, "/") + "'\r\n" +
+        "// generated from '" + inputFilePathRel + "' in '" + thisFilePathRel.replace(/\\/g, "/") + "'\r\n" +
         "/* @internal */\r\n" +
         "namespace ts {\r\n" +
         "    function diag(code: number, category: DiagnosticCategory, key: string, message: string, reportsUnnecessary?: {}, elidedInCompatabilityPyramid?: boolean, reportsDeprecated?: {}): DiagnosticMessage {\r\n" +