Clarify the download unit in the download section (GH-13122)

Doc/tools/templates/download.html

@@ -12,8 +12,7 @@
 {% if last_updated %}<p><b>Last updated on: {{ last_updated }}.</b></p>{% endif %}
 
 <p>To download an archive containing all the documents for this version of
-Python in one of various formats, follow one of links in this table. The numbers
-in the table are the size of the download files in megabytes.</p>
+Python in one of various formats, follow one of links in this table.</p>
 
 <table class="docutils">
   <tr><th>Format</th><th>Packed as .zip</th><th>Packed as .tar.bz2</th></tr>