[css-inline] remove section on initial-line as it is in css-pseudo

Author: dauwhe

css-inline/Overview.bs

@@ -2229,28 +2229,6 @@ element for alignment purpose.
 
 <h2 id="Initial">Initial Lines and Initial Letters</h2>
 
-<h3 id="InitialLine">Initial Lines</h3>
-
-Initial lines of block elements such as paragraphs are often displayed differently than subsequent lines. Initial line may be set in small caps, all caps, or even different fonts. The <code>::first-line</code> pseudo-element allows authors to control the presentation of these initial lines. However, only the following properties can be applied to the <code>::first-line</code> pseudo-element:
-
-
-
-<ul>
-  <li>font properties</li>
-  <li>color properties</li>
-  <li>background properties</li>
-  <li>text decoration properties</li>
-  <li>baseline alignment properties</li>
-  <li>'word-spacing'</li>
-  <li>'letter-spacing'</li>
-  <li>'line-height' (may be ignored depending on the block line-stacking strategy)</li>
-  <li>'text-shadow'</li>
-  <li>'clear'</li>
-  </ul>
-  
-  
-Note that the 'text-indent' property typically only affects the initial line of a block element, unless its value is set to ''hanging''.
-