Improve gerrit recipe_module example

The /a suffix in the hots URL is not necessary as the gerrit_util adds it by
default to authenticate. Having it hard-coded in the example can be misleading.

Bug: 685318
Change-Id: I333cd8b2aa9020aadfd186f2e18fbff0aa917681
Reviewed-on: https://chromium-review.googlesource.com/564611Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>

recipes/recipe_modules/gerrit/examples/full.expected/basic.json

@@ -6,7 +6,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gerrit_client.py",
       "branch",
       "--host",
-      "https://chromium-review.googlesource.com/a",
+      "https://chromium-review.googlesource.com",
       "--project",
       "v8/v8",
       "--branch",
@@ -37,7 +37,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gerrit_client.py",
       "branchinfo",
       "--host",
-      "https://chromium-review.googlesource.com/a",
+      "https://chromium-review.googlesource.com",
       "--project",
       "v8/v8",
       "--branch",
@@ -65,7 +65,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gerrit_client.py",
       "changes",
       "--host",
-      "https://chromium-review.googlesource.com/a",
+      "https://chromium-review.googlesource.com",
       "--json_file",
       "/path/to/tmp/json",
       "--start",

recipes/recipe_modules/gerrit/examples/full.py

@@ -8,7 +8,7 @@ DEPS = [
 
 
 def RunSteps(api):
-  host = 'https://chromium-review.googlesource.com/a'
+  host = 'https://chromium-review.googlesource.com'
   project = 'v8/v8'
 
   branch = 'test'