Update reference docs with most recent version of brodocs (#4600)

* Update 1.7 apidocs with new brodocs

* Update 1.7 resource reference docs with new brodocs

* Update 1.7 kubectl reference docs with new brodocs

docs/resources-reference/v1.7/node_modules/jquery/src/css/curCSS.js

@@ -11,12 +11,18 @@ define( [
 
 function curCSS( elem, name, computed ) {
 	var width, minWidth, maxWidth, ret,
+
+		// Support: Firefox 51+
+		// Retrieving style before computed somehow
+		// fixes an issue with getting wrong values
+		// on detached elements
 		style = elem.style;
 
 	computed = computed || getStyles( elem );
 
-	// Support: IE <=9 only
-	// getPropertyValue is only needed for .css('filter') (#12537)
+	// getPropertyValue is needed for:
+	//   .css('filter') (IE 9 only, #12537)
+	//   .css('--customProperty) (#3144)
 	if ( computed ) {
 		ret = computed.getPropertyValue( name ) || computed[ name ];