[css-text-3] Simplify the behavior of the break-spaces value

As suggested by Myles in #2003

Author: frivoal

css-text-3/Overview.bs

@@ -1202,12 +1202,7 @@ Line Breaking Details</h3>
       except that any sequence of <a>preserved</a> white space
       that would otherwise overflow the line and <a>hang</a> as per <a href="#white-space-phase-2">Trimming and Positioning</a>
       must be broken after the last white space character that would fit the line,
-      or after the first white space in the sequence if none would fit,
-      or before the first space in the sequence if none would fit and both ''overflow-wrap/break-word'' and ''break-spaces'' are specified.
-
-      <p class="note">This last clause is due to the fact that
-      'overflow-wrap: break-words'' allows breaks between any two characters
-      to avoid overflow</p>
+      or after the first white space in the sequence if none would fit.
 
       <p class="note">This value does not guarantee that there will never be any overflow due to spaces.
       For example, if 'overflow-wrap' is set to ''break-spaces''
@@ -1216,10 +1211,8 @@ Line Breaking Details</h3>
       and that space overflows,
       the rules of ''break-spaces'' do not introduce any additional line break,
       and that space does overflow and <a>hang</a>.
-      If 'overflow-wrap' had been set to ''break-word break-spaces'',
-      that space would have been wrapped to the next line,
-      unless the line length is so short that even a single space does not fit,
-      in which case overflow is unavoidable.</p>
+      Also, if the line length is so short that even a single space does not fit,
+      overflow is unavoidable.</p>
 
     </dl>