corrected tos.html location

the /instance/static/static/terms-of-service.html

is the one mentioned in the docs ( https://git.pleroma.social/pleroma/pleroma/-/blob/develop/docs/configuration/static_dir.md#terms-of-service )

and is the currently expected path

static/terms-of-service.html

@@ -2,7 +2,7 @@
 
 <p>This is the default placeholder ToS.  You should copy it over to your static folder and edit it to fit the needs of your instance.</p>
 
-<p>To do so, place a file at <code>"/instance/static/terms-of-service.html"</code> in your
+<p>To do so, place a file at <code>"/instance/static/static/terms-of-service.html"</code> in your
    Pleroma install containing the real ToS for your instance.</p>
 <p>See the <a href='https://docs.pleroma.social/backend/configuration/static_dir/'>Pleroma documentation</a> for more information.</p>
 <br>