added margin bottom to the paragraph before the create change button

Change-Id: I353849ec8a9d8314450358ff3cf1ce6759c319d9
diff --git a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.html b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.html
index e793f42..ecbd67e 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.html
+++ b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.html
@@ -58,6 +58,7 @@
         font-size: var(--font-size-large);
       }
       #help p {
+        margin-bottom: .6em;
         max-width: 35em;
       }
       @media only screen and (max-width: 50em) {