Update content related to school requirements

This changes some of the content related to the school requirements as
requested by our content designer.

app/views/shared/eligible_region_content_components/_proof_of_work_history.html.erb

@@ -9,6 +9,7 @@
 <% end %>
 
 <ul class="govuk-list govuk-list--bullet">
+  <li>worked in a school that delivers mandatory education</li>
   <li>worked unsupervised with children aged between 5 and 16 years</li>
   <li>were solely responsible for planning, preparing and delivering lessons to at least 4 students at a time</li>
   <li>were solely responsible for assessing and reporting on the progress of those students</li>

app/views/teacher_interface/work_histories/_school_form.html.erb

@@ -15,10 +15,12 @@
       <p class="govuk-body">You were:</p>
 
       <ul class="govuk-list govuk-list--bullet">
-        <li>teaching in this role after qualifying</li>
-        <li>unsupervised when working with children aged between 5 and 16 years</li>
-        <li>solely responsible for planning, preparing and delivering lessons to at least 4 students at a time</li>
-        <li>solely responsible for assessing and reporting on the progress of those student</li>
+        <li>employed in a school that delivers mandatory education</li>
+        <li>teaching in the role after gaining your teaching qualification</li>
+        <li>responsible for teaching children aged between 5 and 16 years</li>
+        <li>unsupervised in the teaching role</li>
+        <li>solely responsible for planning, preparing, and delivering lessons to a minimum of 4 students at a time</li>
+        <li>solely responsible for assessing and reporting on the progress of these students</li>
       </ul>
 
       <% unless form.work_history.application_form.reduced_evidence_accepted %>