tweak based on feedback

Co-authored-by: gemmadallmandfe <[email protected]>

app/views/content/subjects/physics/_article.html.erb

@@ -149,7 +149,7 @@
     <p>You can <a href="https://www.iop.org/about/support-grants/iop-teacher-training-scholarships">find out more about the physics scholarship from the Institute of Physics</a>.</p>
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   <section class="col col-space-m col-720">
-  <h3>Improving your physics subject knowledge</h3>
+  <h3>Improve your physics subject knowledge</h3>
   <p> If you need to brush up on your physics knowledge before you become a teacher, you can do a subject knowledge enhancement course.</p>
   <p><a href="/how-to-apply-for-teacher-training/subject-knowledge-enhancement">Find out about subject knowledge enhancement courses</a>.</p>
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