[css-scrollbars] Delete note, it's redundant with the spec's header

Author: frivoal

css-scrollbars-1/Overview.bs

@@ -19,11 +19,6 @@ Link Defaults: css-color-3 (property) color
 <h2 id="intro">
 Introduction</h2>
 
-Note: this specification is 
-<a href="https://github.com/w3c/csswg-drafts/tree/master/css-scrollbars-1">
-maintained in the W3C csswg-drafts GitHub repository as css-scrollbars-1
-</a>.
-
 <h3 id="scope">
 Scope</h3>
 <em>This subsection is non-normative.</em>