fix doc on recently pr (#5432)

apm-sniffer/config/agent.config

@@ -92,7 +92,7 @@ logging.level=${SW_LOGGING_LEVEL:INFO}
 # plugin.kafka.bootstrap_servers=${SW_KAFKA_BOOTSTRAP_SERVERS:localhost:9092}
 
 # Exclude activated plugins
-# plugin.exclude_plugins=${SW_EXCLUDE_PLUGINS:""}
+# plugin.exclude_plugins=${SW_EXCLUDE_PLUGINS:}
 
 # Match spring bean with regex expression for classname
-# plugin.springannotation.classname_match_regex_expression=${SW_SPRINGANNOTATION_CLASSNAME_MATCH_REGEX_EXPRESSION:""}
+# plugin.springannotation.classname_match_regex=${SW_SPRINGANNOTATION_CLASSNAME_MATCH_REGEX:}

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/AbstractSpringBeanInstrumentation.java

@@ -34,7 +34,7 @@ import static net.bytebuddy.matcher.ElementMatchers.named;
 import static net.bytebuddy.matcher.ElementMatchers.not;
 import static org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationMatch.byClassAnnotationMatch;
 import static org.apache.skywalking.apm.agent.core.plugin.match.RegexMatch.byRegexMatch;
-import static org.apache.skywalking.apm.plugin.spring.annotations.SpringAnnotationConfig.Plugin.SpringAnnotation.CLASSNAME_MATCH_REGEX_EXPRESSION;
+import static org.apache.skywalking.apm.plugin.spring.annotations.SpringAnnotationConfig.Plugin.SpringAnnotation.CLASSNAME_MATCH_REGEX;
 
 public abstract class AbstractSpringBeanInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
     private static final String INTERCEPTOR_CLASS = "org.apache.skywalking.apm.plugin.spring.annotations.SpringAnnotationInterceptor";
@@ -72,11 +72,11 @@ public abstract class AbstractSpringBeanInstrumentation extends ClassInstanceMet
 
     @Override
     protected ClassMatch enhanceClass() {
-        if (StringUtil.isEmpty(CLASSNAME_MATCH_REGEX_EXPRESSION)) {
+        if (StringUtil.isEmpty(CLASSNAME_MATCH_REGEX)) {
             return byClassAnnotationMatch(getEnhanceAnnotation());
         } else {
             return LogicalMatchOperation.and(
-                byRegexMatch(CLASSNAME_MATCH_REGEX_EXPRESSION.split(",")),
+                byRegexMatch(CLASSNAME_MATCH_REGEX.split(",")),
                 byClassAnnotationMatch(getEnhanceAnnotation())
             );
         }

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/SpringAnnotationConfig.java

@@ -28,7 +28,7 @@ public class SpringAnnotationConfig {
             /**
              * regex expression to match spring bean classname
              */
-            public static String CLASSNAME_MATCH_REGEX_EXPRESSION = "";
+            public static String CLASSNAME_MATCH_REGEX = "";
         }
     }
 }
\ No newline at end of file

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

@@ -153,7 +153,7 @@ property key | Description | Default |
 `plugin.kafka.topic_segment` | Specify which Kafka topic name for traces data to report to. | `skywalking_segments` |
 `plugin.kafka.topic_profilings` | Specify which Kafka topic name for Thread Profiling snapshot to report to. | `skywalking_profilings` |
 `plugin.kafka.topic_management` | Specify which Kafka topic name for the register or heartbeat data of Service Instance to report to. | `skywalking_managements` |
-`plugin.springannotation.classname_match_regex_expression` |  Match spring beans with regex expression for the class name. Multiple expressions could be separated by a comma. This only works when `Spring annotation plugin` has been activated. | `All the spring beans tagged with @Bean,@Service,@Dao, or @Repository.` |
+`plugin.springannotation.classname_match_regex` |  Match spring beans with regular expression for the class name. Multiple expressions could be separated by a comma. This only works when `Spring annotation plugin` has been activated. | `All the spring beans tagged with @Bean,@Service,@Dao, or @Repository.` |
 
 
 ## Optional Plugins