[resize-observer-1] Don't put index.html in the URL

Author: fantasai

resize-observer-1/Overview.bs

@@ -4,9 +4,9 @@ Shortname: resize-observer
 Level: 1
 Status: ED
 Work Status: Exploring
-ED: https://drafts.csswg.org/resize-observer/index.html
+ED: https://drafts.csswg.org/resize-observer/
 Group: CSSWG
-URL: https://drafts.csswg.org/resize-observer/index.html
+URL: https://drafts.csswg.org/resize-observer/
 Editor: Greg Whitworth, Microsoft, gwhit@microsoft.com
 Former Editor: Aleks Totic, Google, atotic@google.com
 Abstract: This specification describes an API for observing changes to Element's size.
@@ -627,4 +627,4 @@ For each fully active Document in docs, run the following steps for that Documen
 
 6. If {{Document}} <a>has skipped observations</a> then <a>deliver resize loop error notification</a>
 
-7. Update the rendering or user interface of {{Document}} and its browsing context to reflect the current state.
+7. Update the rendering or user interface of {{Document}} and its browsing context to reflect the current state.