Update WebDriver spec URL in ChromeDriver documentation

The old URL redirected to the new one.

Change-Id: I9d2f76ec2fb70979713089c70a8f33a413e2705d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279779
Auto-Submit: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785241}

docs/chromedriver_status.md

 # WebDriver Status
 
-Below is a list of all WebDriver commands and their current support in ChromeDriver based on what is in the [WebDriver Specification](https://w3c.github.io/webdriver/webdriver-spec.html).
+Below is a list of all WebDriver commands and their current support in ChromeDriver based on what is in the [WebDriver Specification](https://w3c.github.io/webdriver/).
 
 | Method | URL | Command | Status | Bug
 | --- | --- | --- | --- | --- |