doc: indicate the format of process.version

dguo · dguo · commit fd97f8593e33 · 2020-08-21T22:06:43.000-04:00
diff --git a/doc/api/process.md b/doc/api/process.md
@@ -2498,7 +2498,8 @@ added: v0.1.3
 
 * {string}
 
-The `process.version` property returns the Node.js version string.
+The `process.version` property returns the Node.js version string in the form of
+`v<major>.<minor>.<patch>`.
 
 ```js
 console.log(`Version: ${process.version}`);
