[css-writing-modes] Add two issues from ML and Sydney F2F minutes

Author: kojiishi

css-writing-modes/Overview.bs

@@ -1245,11 +1245,13 @@ Orienting Text: the 'text-orientation' property</h3>
       value other than ''sideways-left'', an analogous transformation (and
       bidi isolation) is applied.
       <p class="note">This value is at-risk and may be dropped during CR.
+      <p class="issue"><a href="https://lists.w3.org/Archives/Public/www-style/2015Apr/0026.html">float interaction when line-left and line-right swap</a>
     <dt><dfn>sideways</dfn></dt>
     <dd><p>This value is equivalent to ''sideways-right'' in ''vertical-rl''
       writing mode and equivalent to ''sideways-left'' in ''vertical-lr''
       writing mode. It can be useful when setting horizontal script text
       vertically in a primarily horizontal-only document.
+      <p class="issue"><a href="https://lists.w3.org/Archives/Public/www-style/2015Mar/0188.html">Sydney F2F 2015-02-09</a>
     <dt><dfn>use-glyph-orientation</dfn></dt>
     <dd><p>[[!SVG11]] defines 'glyph-orientation-vertical' and
       'glyph-orientation-horizontal' properties that were intended to control