Adjust 'note' wrapping on generated OSSAs

Wrap at a more conservative 70 chars so that the generated RST
doesn't need to be adjusted for plaintext clients that wrap at
72 chars.

Change-Id: I53b628c0678166f43657f61a972dde4f08c91b09

doc/source/_exts/rst.jinja

@@ -64,7 +64,7 @@ References
 Notes
 ~~~~~
 {% for note in notes %}
-- {{ note | wordwrap(width=77, break_long_words=False, wrapstring='\n  ') }}
+- {{ note | wordwrap(width=70, break_long_words=False, wrapstring='\n  ') }}
 {% endfor %}
 {% endif %}
 {% if errata %}