[css-2017] Update shortname of Filters spec.

Author: tabatkins

css-2017/Overview.bs

@@ -271,7 +271,7 @@ Background: The W3C Process and CSS</h3>
 			  [[CSS-TEXT-3]]
 			<dd>
 				Defines properties for text manipulation and specifies their processing model.
-				It covers line breaking, justification and alignment, white space handling, and text transformation. 
+				It covers line breaking, justification and alignment, white space handling, and text transformation.
 			</dl>
 	</div>
 
@@ -685,7 +685,7 @@ Preserving the Openness of CSS</h5>
 	css-speech-1,
 	css-align-3,
 	css-grid-1,
-	filters-1,
+	filter-effects-1,
 	css-break-3"></index>
 
 <h3 id="selectors">Selector Index</h3>
@@ -722,7 +722,7 @@ Preserving the Openness of CSS</h5>
 	css-speech-1,
 	css-align-3,
 	css-grid-1,
-	filters-1,
+	filter-effects-1,
 	css-break-3"></index>
 
 <h3 id="at-rules">
@@ -760,7 +760,7 @@ At-Rule Index</h3>
 	css-speech-1,
 	css-align-3,
 	css-grid-1,
-	filters-1,
+	filter-effects-1,
 	css-break-3"></index>
 
 <h3 id="properties">Property Index</h3>
@@ -797,7 +797,7 @@ At-Rule Index</h3>
 	css-speech-1,
 	css-align-3,
 	css-grid-1,
-	filters-1,
+	filter-effects-1,
 	css-break-3"></index>
 
 <h3 id="values">Values Index</h3>
@@ -834,7 +834,7 @@ At-Rule Index</h3>
 	css-speech-1,
 	css-align-3,
 	css-grid-1,
-	filters-1,
+	filter-effects-1,
 	css-break-3"></index>
 
 Acknowledgements {#acks}