Enable the plugin by default

New users who install the plugin are most likely going to expect
it to be enabled and work out-of-the-box.  Rather than ask users
to then also enable it by configuration, restore the default to
the previous behavior of automatically enabling it.

Projects can still disable this by default (or, presumably an admin
could set the default in All-Projects to false and then projects
can individually enable it).

Also, reword some documentation regarding Zuul's name.

Change-Id: I03b58bb6fa8b6db62793c05a0ec17309165c16f1
diff --git a/java/com/googlesource/gerrit/plugins/zuulresultssummary/GetConfig.java b/java/com/googlesource/gerrit/plugins/zuulresultssummary/GetConfig.java
index 46a09b0..99ea995 100644
--- a/java/com/googlesource/gerrit/plugins/zuulresultssummary/GetConfig.java
+++ b/java/com/googlesource/gerrit/plugins/zuulresultssummary/GetConfig.java
@@ -41,7 +41,7 @@
     result.enabled =
         cfgFactory
             .getFromProjectConfigWithInheritance(project.getNameKey(), pluginName)
-            .getBoolean(Module.KEY_PLUGIN_ENABLED, false);
+            .getBoolean(Module.KEY_PLUGIN_ENABLED, true);
 
     return Response.ok(result);
   }
diff --git a/resources/Documentation/config.md b/resources/Documentation/config.md
index 8711f5c..95e4db0 100644
--- a/resources/Documentation/config.md
+++ b/resources/Documentation/config.md
@@ -2,16 +2,15 @@
 ===============
 
 The plugin populates tab that shows a summary of results posted
-by the Zuul CI system.
+by the Zuul Project Gating system.
 
-It can be configured per project whether the Zuul CI integration is
-enabled or not. To enable the Zuul CI integration for a project the
-project must have the following entry in its `project.config` file in
-the `refs/meta/config` branch:
+It can be configured per project whether Zuul integration is enabled
+or not. To disable Zuul integration for a project, add the following
+entry to its `project.config` file in the `refs/meta/config` branch:
 
 ```
   [plugin "zuul-results-summary"]
-    enabled = true
+    enabled = false
 ```
 
-Per default projects are not enabled for Zuul CI integration.
+The default is true (Zuul integration is enabled).
diff --git a/resources/Documentation/rest-api-config.md b/resources/Documentation/rest-api-config.md
index 99722ae..a61b62e 100644
--- a/resources/Documentation/rest-api-config.md
+++ b/resources/Documentation/rest-api-config.md
@@ -51,7 +51,7 @@
 
 |Field Name       |Description|
 |-----------------|-----------|
-|enabled          | Whether the project is enabled for Zuul CI integration|
+|enabled          | Whether the project is enabled for Zuul integration|
 
 
 SEE ALSO