docs(@angular/cli): Include base-href flag in e2e documentation

Author: deadwards90

docs/documentation/e2e.md

@@ -14,6 +14,16 @@ ng e2e
 End-to-end tests are run via [Protractor] (https://angular.github.io/protractor/).
 
 ## Options
+<details>
+  <summary>base href</summary>
+  <p>
+    <code>--base-href</code>
+  </p>
+  <p>
+    Override the baseUrl in the protractor config. Defaults to the baseUrl in the protractor config.
+  </p>
+</details>
+
 <details>
   <summary>config</summary>
   <p>