clarify `size` is only used for avatars. Related: crafatar/setup#5

lib/views/index.html.ejs

@@ -190,7 +190,7 @@
               Example: <code><%= domain %>/avatars/853c80ef3c3749fdaa49938b674adae6<mark class="blue">?</mark><mark class="green">size=4</mark><mark class="blue">&</mark><mark class="green">default=MHF_Steve</mark><mark class="blue">&</mark><mark class="green">overlay</mark></code>
             </p>
             <ul>
-              <li><b>size</b>: The size of the image in pixels. <code><%= config.avatars.min_size %> - <%= config.avatars.max_size %></code>
+              <li><b>size</b>: The size for avatars in pixels. <code><%= config.avatars.min_size %> - <%= config.avatars.max_size %></code>
               <li><b>scale</b>: The scale factor for renders. <code><%= config.renders.min_scale %> - <%= config.renders.max_scale %></code>
               <li><b>overlay</b>: Apply the <span title="Also known as 'hat' or 'jacket' or 'helm'">overlay</span> to the avatar. Presence of this parameter implies <code>true</code>. This option was previously known as <code>helm</code>.
               <li>