tools: consolidate 'introduced_in' check for docs

PR-URL: #57109
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: 1ilsang

doc/api/typescript.md

@@ -10,6 +10,8 @@ changes:
  description: Added `--experimental-transform-types` flag.
 -->
 
+<!--introduced_in=v23.6.0-->
+
 > Stability: 1.1 - Active development
 
 ## Enabling

tools/lint-md/lint-md.mjs

@@ -34,6 +34,14 @@ paths.forEach(async (path) => {
 constfileContents=file.toString();
 constresult=awaitlinter.process(file);
 constisDifferent=fileContents!==result.toString();
+
+if(path.startsWith('doc/api/')){
+if(!fileContents.includes('introduced_in')){
+console.error(`${path} is missing an 'introduced_in' version. Please add one.`);
+process.exitCode=1;
+}
+}
+
 if(format){
 if(isDifferent){
 fs.writeFileSync(path,result.toString());