Docs: Fix some minor issues in comments

Changes:
1. Eliminate mentions of Karma.
2. Replace `"root granchild"` with `"root grandchild"`.
3. Collapse duplicate "the the" & "with with" into single words.

Closes jquerygh-5662

Signed-off-by: studystill <chenghuiyue@outlook.com>
Co-authored-by: Michał Gołębiowski-Owczarek <m.goleb@gmail.com>

Author: studystill

test/unit/core.js

@@ -1611,7 +1611,7 @@ QUnit.test( "jQuery.contains in SVG (jQuery trac-10832)", function( assert ) {
 
 	assert.ok( jQuery.contains( svg, svg.firstChild ), "root child" );
 	assert.ok( jQuery.contains( svg.firstChild, svg.firstChild.firstChild ), "element child" );
-	assert.ok( jQuery.contains( svg, svg.firstChild.firstChild ), "root granchild" );
+	assert.ok( jQuery.contains( svg, svg.firstChild.firstChild ), "root grandchild" );
 	assert.ok( !jQuery.contains( svg.firstChild.firstChild, svg.firstChild ),
 		"parent (negative)" );
 } );

test/unit/event.js

@@ -1672,9 +1672,9 @@ QUnit.test( ".on()/.off()", function( assert ) {
 
 	// Test binding with different this object, event data, and trigger data
 	jQuery( "#body" ).on( "click", "#foo", true, function( e, data ) {
-		assert.equal( e.data, true, "on with with different this object, event data, and trigger data" );
-		assert.equal( this.foo, "bar", "on with with different this object, event data, and trigger data" );
-		assert.equal( data, true, "on with with different this object, event data, and trigger data" );
+		assert.equal( e.data, true, "on with different this object, event data, and trigger data" );
+		assert.equal( this.foo, "bar", "on with different this object, event data, and trigger data" );
+		assert.equal( data, true, "on with different this object, event data, and trigger data" );
 	}.bind( { "foo": "bar" } ) );
 	jQuery( "#foo" ).trigger( "click", true );
 	jQuery( "#body" ).off( "click", "#foo" );

test/unit/manipulation.js

@@ -2343,8 +2343,7 @@ testIframe(
 
 // We need to simulate cross-domain requests with the feature that
 // both 127.0.0.1 and localhost point to the mock http server.
-// Skip the the test if we are not in localhost but make sure we run
-// it in Karma.
+// Skip the test if we are not in localhost.
 QUnit[
 	includesModule( "ajax" ) && location.hostname === "localhost" ?
 		"test" :