fixed typos, added vm unit as issue

Author: howcom

css3-values/Overview.src.html

@@ -455,7 +455,7 @@ <h5>The 'vw' unit</h5>
 <p>If the width of the viewport is 200mm, the font size of <code
 class="html">h1</code> elements will be 16mm ((8&times;200)/100). When
 the width of the viewport is changed (for example, when the browser
-window is enlarged), lengths specified in the 'vh' unit is scaled
+window is enlarged), lengths specified in the 'vw' unit are scaled
 proportionally.
 
 <h5>The 'vh' unit</h5>
@@ -469,12 +469,15 @@ <h5>The 'vh' unit</h5>
 
 <h5>The 'vm' unit</h5>
 
+<p class=issue>Do we need this now that we have the min() function?
+
 <p>The <dfn title="vm (unit)">vm</dfn> unit is relative to
 the viewport's height or width, whichever of the two is smaller.
 The minimum of the viewport's width/height is equivalent to 100 ''vm''
 units. When the height or width of the viewport is changed, lengths
 specified in the 'vm' unit are scaled proportionally.
 
+
 <h4>The 'calc', 'min' and 'max' functions</h4>
 
 <p>The <dfn>calc()</dfn>, <dfn>min()</dfn>, and <dfn>max()</dfn> functions can be used wherever length values are allowed.