Switch Javadoc <code>...</code> to {@code ...}

Update Javadoc to use the {@code ...} syntax when possible.

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/AstUtils.java

@@ -138,7 +138,7 @@ public abstract class AstUtils {
 	}
 
 	/**
-	 * Extract a top-level <code>name</code> closure from inside this block if there is
+	 * Extract a top-level {@code name} closure from inside this block if there is
 	 * one, optionally removing it from the block at the same time.
 	 * @param block a block statement (class definition)
 	 * @param name the name to look for

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/GroovyCompiler.java

@@ -55,7 +55,7 @@ import org.springframework.core.annotation.AnnotationAwareOrderComparator;
  * features:
  * <ul>
  * <li>{@link CompilerAutoConfiguration} strategies will be read from
- * <code>META-INF/services/org.springframework.boot.cli.compiler.CompilerAutoConfiguration</code>
+ * {@code META-INF/services/org.springframework.boot.cli.compiler.CompilerAutoConfiguration}
  * (per the standard java {@link ServiceLoader} contract) and applied during compilation</li>
  *
  * <li>Multiple classes can be returned if the Groovy source defines more than one Class</li>