Add missing dependency in MP guide

Author: tvallin

docs/src/main/asciidoc/mp/guides/security-oidc.adoc

@@ -233,8 +233,12 @@ cd helidon-quickstart-mp
 Update the pom.xml file and add the following Helidon dependency to the `<dependencies>` section.
 
 [source,xml]
-.Add the following dependency to `pom.xml`:
+.Add the following dependencies to `pom.xml`:
 ----
+<dependency>
+    <groupId>io.helidon.microprofile</groupId>
+    <artifactId>helidon-microprofile-security</artifactId>
+</dependency>
 <dependency>
     <groupId>io.helidon.microprofile</groupId>
     <artifactId>helidon-microprofile-oidc</artifactId>

docs/src/main/java/io/helidon/docs/mp/guides/SecurityOidcSnippets.java

@@ -36,12 +36,12 @@
 class SecurityOidcSnippets {
 
     // stub
-    static GreetingMessage createResponse(String str) {
+    static Message createResponse(String str) {
         return null;
     }
 
     // stub
-    record GreetingMessage() {
+    record Message() {
         String getMessage() {
             return "";
         }
@@ -51,7 +51,7 @@ String getMessage() {
     @Authenticated
     @GET
     @Produces(MediaType.APPLICATION_JSON)
-    public GreetingMessage getDefaultMessage() {
+    public Message getDefaultMessage() {
         return createResponse("World");
     }
     // end::snippet_1[]
@@ -76,7 +76,7 @@ void snippet_5(WebTarget target) {
     void snippet_6(WebTarget target) {
         // tag::snippet_4[]
         String encoding = Base64.getEncoder().encodeToString("jack:changeit".getBytes());
-        GreetingMessage jsonMessage = target
+        Message jsonMessage = target
                 .path("greet")
                 .request()
                 .header(HttpHeaders.AUTHORIZATION, "Basic " + encoding)