docs: normalize wording to documentation

Author: Aniketsy

Doc/about.rst

@@ -10,7 +10,7 @@ and now maintained as an independent project.
 .. _reStructuredText: https://docutils.sourceforge.io/rst.html
 .. _Sphinx: https://www.sphinx-doc.org/
 
-.. In the online version of these documents, you can submit comments and suggest
+.. In the online version of this documentation, you can submit comments and suggest
    changes directly on the documentation pages.
 
 Development of the documentation and its toolchain is an entirely volunteer

Doc/tools/templates/indexsidebar.html

@@ -1,5 +1,5 @@
 <h3>{% trans %}Download{% endtrans %}</h3>
-<p><a href="{{ pathto('download') }}">{% trans %}Download these documents{% endtrans %}</a></p>
+<p><a href="{{ pathto('download') }}">{% trans %}Download the documentation{% endtrans %}</a></p>
 <h3>{% trans %}Docs by version{% endtrans %}</h3>
 <ul>
   {# _docs_by_version.html is overwritten by build_docs.py for non-EOL versions #}