Simplify README and remove outdated build step

Signed-off-by: AutomatedTester <dburns@mozilla.com>

README.md

@@ -3,20 +3,14 @@
 This repository contains the W3C specification
 for the browser automation protocol known as _WebDriver_.
 
-The current editor's draft of the specification can be read
-at https://w3c.github.io/webdriver/webdriver-spec.html.
+The editor’s draft of the specification can be read at
+https://w3c.github.io/webdriver/webdriver-spec.html.
 The main repository is at https://github.com/w3c/webdriver,
 and bugs can be filed against the
 [W3C bug tracker](https://www.w3.org/Bugs/Public/enter_bug.cgi?comment=&blocked=20860&short_desc=%5BWebDriver%20Spec%5D%3A%20&product=Browser%20Test%2FTools%20WG&component=WebDriver).
 
-The specification can be read in `webdriver-spec.html`,
-which is generated by executing:
+Patch `webdriver-spec.html` for pull requests.
 
-    make
+To validate the specification:
 
-The numbers at the start of each file corresponds to sections in the spec
-and will be included in the final document in that order.
-
-And to validate the specification:
-
-    make validate
+    make validate