dev-plugins: Fix included-in filtering doc

Fix a typo and remove an unused import line from the code example.

Change-Id: I04339d0d70e8a36a7d535dc4139774d47bf5dba5
Release-Notes: skip
diff --git a/Documentation/dev-plugins.txt b/Documentation/dev-plugins.txt
index bcc96b4..df96e62 100644
--- a/Documentation/dev-plugins.txt
+++ b/Documentation/dev-plugins.txt
@@ -2248,7 +2248,7 @@
 e.g. a plugin can provide a list of servers on which the change was
 deployed.
 
-Plugins can filter the branches and tags that are inlcuded by implementing
+Plugins can filter the branches and tags that are included by implementing
 `com.google.gerrit.server.change.FilterIncludedIn`.
 
 [source, java]
@@ -2281,7 +2281,6 @@
 
 [source, java]
 ----
-import com.google.gerrit.extensions.annotations.Exports;
 import com.google.gerrit.extensions.registration.DynamicSet;
 import com.google.gerrit.server.change.FilterIncludedIn;
 import com.google.inject.AbstractModule;