Changing pagination results number (#956)

* docs(pagination): update results indexes on pagination example

The paginion component example shows as page 2, but also outputs
"showing results 10-20 of 30". This commit updates that to be results
11-20 as would actually be displayed.

* fix(pagination): fix aria label for pages to use total pages instead of total results

The `aria-label` for each page entry was of the form "page x of y" where y was the total number of
results, rather than the total number of pages. This PR fixes the error

---------

Co-authored-by: Chris Pymm <chris@chrispymm.co.uk>

docs/examples/pagination/index.njk

@@ -25,7 +25,7 @@ arguments: pagination
   }],
   results: {
     count: 30,
-    from: 10,
+    from: 11,
     to: 20,
     text: 'results'
   },

src/moj/components/pagination/template.njk

@@ -12,9 +12,9 @@
         <li class="moj-pagination__item moj-pagination__item--dots">…</li>
       {% else %}
         {%- if item.selected %}
-          <li class="moj-pagination__item moj-pagination__item--active" aria-label="Page {{ item.text }} of {{ params.results.count }}" aria-current="page">{{ item.text }}</li>
+          <li class="moj-pagination__item moj-pagination__item--active" aria-label="Page {{ item.text }} of {{ params.items | length }}" aria-current="page">{{ item.text }}</li>
         {% else %}
-          <li class="moj-pagination__item"><a class="moj-pagination__link" href="{{ item.href }}" aria-label="Page {{ item.text }} of {{ params.results.count }}">{{ item.text }}</a></li>
+          <li class="moj-pagination__item"><a class="moj-pagination__link" href="{{ item.href }}" aria-label="Page {{ item.text }} of {{ params.items | length }}">{{ item.text }}</a></li>
         {% endif -%}
       {% endif -%}
     {% endfor -%}