Docs:Tests: Update IE/Edge-related support comments & tests

Closes gh-3661

src/ajax.js

@@ -538,7 +538,7 @@ jQuery.extend( {
 		if ( s.crossDomain == null ) {
 			urlAnchor = document.createElement( "a" );
 
-			// Support: IE <=8 - 11, Edge 12 - 13
+			// Support: IE <=8 - 11, Edge 12 - 15
 			// IE throws exception on accessing the href property if url is malformed,
 			// e.g. http://example.com:80x/
 			try {

src/core.js

@@ -288,7 +288,7 @@ jQuery.extend( {
 	},
 
 	// Convert dashed to camelCase; used by the css and data modules
-	// Support: IE <=9 - 11, Edge 12 - 13
+	// Support: IE <=9 - 11, Edge 12 - 15
 	// Microsoft forgot to hump their vendor prefix (#9572)
 	camelCase: function( string ) {
 		return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );

src/effects.js

@@ -148,9 +148,10 @@ function defaultPrefilter( elem, props, opts ) {
 	// Restrict "overflow" and "display" styles during box animations
 	if ( isBox && elem.nodeType === 1 ) {
 
-		// Support: IE <=9 - 11, Edge 12 - 13
+		// Support: IE <=9 - 11, Edge 12 - 15
 		// Record all 3 overflow attributes because IE does not infer the shorthand
-		// from identically-valued overflowX and overflowY
+		// from identically-valued overflowX and overflowY and Edge just mirrors
+		// the overflowX value there.
 		opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];
 
 		// Identify a display type, preferring old show/hide data over the CSS cascade

src/manipulation.js

@@ -38,7 +38,7 @@ var
 
 	/* eslint-enable */
 
-	// Support: IE <=10 - 11, Edge 12 - 13
+	// Support: IE <=10 - 11, Edge 12 - 13 only
 	// In IE/Edge using regex groups here causes severe slowdowns.
 	// See https://connect.microsoft.com/IE/feedback/details/1736512/
 	rnoInnerhtml = /<script|<style|<link/i,