[asciidoctor] add missing tag for declared exception (#4630)

Fix Javadoc warning

Author: jmini

modules/openapi-generator/src/test/java/org/openapitools/codegen/asciidoc/AsciidocSampleGeneratorTest.java

@@ -64,6 +64,7 @@ public void testMarkupExistence() {
 
     /**
      * ensure api-docs.json includes sample and spec files directory as attributes.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationFromJsonWithAttributes() throws Exception {
@@ -75,6 +76,7 @@ public void testSampleAsciidocMarkupGenerationFromJsonWithAttributes() throws Ex
 
     /**
      * ensure api-docs.json includes sample and spec files into markup.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationFromJsonWithIncludes() throws Exception {
@@ -98,6 +100,7 @@ public void testSampleAsciidocMarkupGenerationFromJsonWithIncludes() throws Exce
 
     /**
      * markup doc header content.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationFromJsonWithContent() throws Exception {
@@ -108,6 +111,7 @@ public void testSampleAsciidocMarkupGenerationFromJsonWithContent() throws Excep
 
     /**
      * fix: parameter name unchanged.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationParameterNameUnchanged() throws Exception {
@@ -117,6 +121,7 @@ public void testSampleAsciidocMarkupGenerationParameterNameUnchanged() throws Ex
 
     /**
      * added apikey info in access section.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationAccessApiKey() throws Exception {
@@ -130,6 +135,7 @@ public void testSampleAsciidocMarkupGenerationAccessApiKey() throws Exception {
 
     /**
      * no form params in this sample spec.
+     * @throws Exception exception
      */
     @Test
     public void testSampleAsciidocMarkupGenerationWithoutFormParameter() throws Exception {