[css-text-3] Clarify break-spaces. w3c#5783

Author: fantasai

css-text-3/Overview.bs

@@ -1950,11 +1950,14 @@ Order of Operations</h4>
              Note: [=Hanging=] the white space rather than collapsing it
              allows users to see the space when selecting or editing text.
           <li>If 'white-space' is set to ''break-spaces'',
-             [=hanging=] or collapsing the advance width of the [=spaces=],
-             [=tabs=],
-             or [=other space separators=]
-             at the end of the line is not allowed;
-             those that overflow must <a>wrap</a> to the next line.
+             [=spaces=], [=tabs=], and [=other space separators=]
+             are treated the same as other visible characters:
+             they cannot [=hang=] nor have their advance width collapsed.
+
+             Note: Such characters therefore take up space,
+             and depending on the available space
+             and applicable line breaking controls
+             will either overflow or cause the line to wrap.
 
              <wpt>
                white-space/break-spaces-001.html