Added alias to block 'product.info.description'

Fixes bug where https://github.com/chedaroo/magento2/blob/05ac0d1915b4170a50dfa4ceb597fac3d74f1b23/app/code/Magento/Catalog/view/frontend/templates/product/view/details.phtml#L25 uses alias html attributes.

Problem is as there is no **alias** on this block it's falling back to the block **name** instead which contains `.`.

This is leading to elements with invalid html attribute values, specifically ID's

Author: chedaroo

app/code/Magento/Catalog/view/frontend/layout/catalog_product_view.xml

@@ -130,7 +130,7 @@
                 </block>
             </container>
             <block class="Magento\Catalog\Block\Product\View\Description" name="product.info.details" template="Magento_Catalog::product/view/details.phtml" after="product.info.media">
-                <block class="Magento\Catalog\Block\Product\View\Description" name="product.info.description" template="Magento_Catalog::product/view/attribute.phtml" group="detailed_info">
+                <block class="Magento\Catalog\Block\Product\View\Description" name="product.info.description" as="description" template="Magento_Catalog::product/view/attribute.phtml" group="detailed_info">
                     <arguments>
                         <argument name="at_call" xsi:type="string">getDescription</argument>
                         <argument name="at_code" xsi:type="string">description</argument>