tf-a-builder: Update USE_TUXSUITE_FVP's description

To be clearer and consistent with othe jobs of the pipeline.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ib9e1398e8c3806c1a45a6eae61029e1fe245bcc5
diff --git a/tf-a-builder.yaml b/tf-a-builder.yaml
index 0bab147..a1ca1c4 100644
--- a/tf-a-builder.yaml
+++ b/tf-a-builder.yaml
@@ -93,7 +93,7 @@
             name: USE_TUXSUITE_FVP
             default: 0
             description: |
-              Whether to submit FVP tests to TuxSuite
+              Whether to submit FVP tests via TuxSuite (instead of LAVA)
         - string:
             name: SHARE_FOLDER
             default: '/srv/shared/${JOB_NAME}/${BUILD_NUMBER}'