e2e-tests: Mention http credentials in documentation

Move the clone command to first in the now sorted (related) list.

Change-Id: I65ad15e5a7178b6ddeb43c5694985dfb09ae91b4
diff --git a/Documentation/dev-e2e-tests.txt b/Documentation/dev-e2e-tests.txt
index c8c2ab88..c57b38e 100644
--- a/Documentation/dev-e2e-tests.txt
+++ b/Documentation/dev-e2e-tests.txt
@@ -105,12 +105,14 @@
 
 Valid commands are:
 
+* `clone`
 * `fetch`
 * `pull`
 * `push`
-* `clone`
 
-The example above assumes that the `loadtest-repo` project exists in the Gerrit under test.
+The example above assumes that the `loadtest-repo` project exists in the Gerrit under test. The
+`HTTP Credentials` or password obtained from test user's `Settings` (in Gerrit) may be required, in
+`src/test/resources/application.conf`, depending on the above commands used.
 
 == How to run tests