Fixes typo (bellow -> below) (#7449)

changelog.d/7449.misc

+Fix some typos in the notice_expiry templates.

synapse/res/templates/notice_expiry.html

@@ -30,7 +30,7 @@
                         <tr>
                           <td colspan="2">
                             <div class="noticetext">Your account will expire on {{ expiration_ts|format_ts("%d-%m-%Y") }}. This means that you will lose access to your account after this date.</div>
-                            <div class="noticetext">To extend the validity of your account, please click on the link bellow (or copy and paste it into a new browser tab):</div>
+                            <div class="noticetext">To extend the validity of your account, please click on the link below (or copy and paste it into a new browser tab):</div>
                             <div class="noticetext"><a href="{{ url }}">{{ url }}</a></div>
                           </td>
                         </tr>

synapse/res/templates/notice_expiry.txt

@@ -2,6 +2,6 @@ Hi {{ display_name }},
 
 Your account will expire on {{ expiration_ts|format_ts("%d-%m-%Y") }}. This means that you will lose access to your account after this date.
 
-To extend the validity of your account, please click on the link bellow (or copy and paste it to a new browser tab):
+To extend the validity of your account, please click on the link below (or copy and paste it to a new browser tab):
 
 {{ url }}