Document how a plugin can get its name injected

Change-Id: I2065492b32dee2eb66c1c2e608bd6eec62c28c45
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/dev-plugins.txt b/Documentation/dev-plugins.txt
index c0c44f3..5d57862 100644
--- a/Documentation/dev-plugins.txt
+++ b/Documentation/dev-plugins.txt
@@ -174,6 +174,23 @@
 ]
 ----
 
+A plugin can get its own name injected at runtime:
+
+[source,java]
+----
+public class MyClass {
+
+  private final String pluginName;
+
+  @Inject
+  public MyClass(@PluginName String pluginName) {
+    this.pluginName = pluginName;
+  }
+
+  ...
+}
+----
+
 [[reload_method]]
 Reload Method
 ~~~~~~~~~~~~~