Improve description for addons option count (Z#23219101)

doc/api/fundamentals.rst

@@ -117,7 +117,7 @@ List-level conditional fetching
 If modification checks are not possible with this granularity, you can instead check for the full list.
 In this case, the list of objects may contain a regular HTTP header ``Last-Modified`` with the date of the
 last modification to any item of that resource. You can then pass this date back in your next request in the
-``If-Modified-Since`` header. If any object has changed in the meantime, you will receive back a full list
+``If-Modified-Since`` header. If the any object has changed in the meantime, you will receive back a full list
 (if something it missing, this means the object has been deleted). If nothing happened, we'll send back a
 ``304 Not Modified`` return code.
 

src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html

@@ -24,7 +24,7 @@
         {% elif c.min_count == 0 %}
             <p class="addon-count-desc" id="c-{{ form.pos.pk }}-{{ category_idx }}-addon-count-desc">
                 {% blocktrans trimmed count max_count=c.max_count %}
-                    You can choose {{ max_count }} option from this category.
+                    You can choose one option from this category.
                 {% plural %}
                     You can choose up to {{ max_count }} options from this category.
                 {% endblocktrans %}