Update index.md format

Author: kennytm

index.md

@@ -11,5 +11,8 @@ layout: default
 {{- "|" -}}
 <span class="status-{{ status.windows }}">{{ status.windows | replace: '-', ' ' }}</span>
 {{- "|" -}}
-<a href="https://github.com/rust-lang/rust/commits/{{ status.commit }}">{{ status.commit | truncate: 9, "" }}</a> on <date datetime="{{ status.datetime }}">{{ status.datetime | date_to_string }}</date> |
+<a href="https://github.com/rust-lang/rust/commits/{{ status.commit }}">{{ status.commit | truncate: 9, "" }}</a> on <date datetime="{{ status.datetime }}">{{ status.datetime | date: "%Y-%m-%d %H:%M:%S" }}</date> |
 {%- endfor -%}
+
+The table above reflects the real-time status on the master branch. 
+Please also check <https://mexus.github.io/rustup-components-history/> for availability of each component on nightly.