Update and rename Spring-bean-plugins.md to Spring-annotation-plugin.md (#2299)

* Update and rename Spring-bean-plugins.md to Spring-annotation-plugin.md

* Update README.md

* Update README.md

docs/en/setup/service-agent/java-agent/README.md

@@ -83,7 +83,7 @@ Java agent plugins are all pluggable. Optional plugins could be provided in `opt
 For using these plugins, you need to put the target plugin jar file into `/plugins`.
 
 Now, we have the following known optional plugins.
-* [Trace Spring beans](agent-optional-plugins/Spring-bean-plugins.md)
+* [Trace Spring annotation beans](agent-optional-plugins/Spring-annotation-plugin.md)
 * [Trace Oracle and Resin](agent-optional-plugins/Oracle-Resin-plugins.md)
 * [Filter traces through specified endpoint name patterns](agent-optional-plugins/trace-ignore-plugin.md)
 * Gson serialization lib in optional plugin folder

docs/en/setup/service-agent/java-agent/agent-optional-plugins/Spring-bean-plugins.md → docs/en/setup/service-agent/java-agent/agent-optional-plugins/Spring-annotation-plugin.md

-## Spring bean plugin
+## Spring annotation plugin
 This plugin allows to trace all methods of beans in Spring context, which are annotated with
 `@Bean`, `@Service`, `@Component` and `@Repository`.