test_suite_ssl: update description for conf_curve and conf_gruop tests

These tests are about EC curves/groups, not DH ones, so the description
should be updated accordingly.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index abc6fa6..8d9e8bb 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -3062,7 +3062,7 @@
 depends_on:MBEDTLS_SSL_PROTO_TLS1_3:MBEDTLS_SSL_SESSION_TICKETS:MBEDTLS_SSL_SRV_C
 ssl_serialize_session_load_buf_size:0:"":MBEDTLS_SSL_IS_SERVER:MBEDTLS_SSL_VERSION_TLS1_3
 
-Test configuration of groups for DHE through mbedtls_ssl_conf_groups()
+Test configuration of EC groups through mbedtls_ssl_conf_groups()
 conf_group:
 
 Version config: valid client TLS 1.2 only