Change wording on successful identity provider validation. (unitycata…

…log#509)

**PR Checklist**

- [ ] A description of the changes is added to the description of this
PR.
- [ ] If there is a related issue, make sure it is linked to this PR.
- [ ] If you've fixed a bug or added code that should be tested, add
tests!
- [ ] If you've added or modified a feature, documentation in `docs` is
updated

**Description of changes**

Simple wording change for CLI login process.

Signed-off-by: Teghan Nightengale <tnightengale@gmail.com>

examples/cli/src/main/java/io/unitycatalog/cli/utils/Oauth2CliExchange.java

@@ -243,7 +243,7 @@ public void handle(HttpExchange exchange) throws IOException {
       String value = parameters.get("code").get(0);
 
       // Prepare response send to browser.
-      String response = "Authentication to UC successful.";
+      String response = "User validated with identity provider.";
       exchange.sendResponseHeaders(HTTP_OK, response.getBytes().length);
       OutputStream os = exchange.getResponseBody();
       os.write(response.getBytes());