docs(material/table): use a hover color that is consistent with Material Design spec (#18193)

Splaktar · andrewseguin · commit 4405429d9727 · 2020-01-16T10:26:14.000-08:00
- ref: https://material.io/components/data-tables/#behavior
diff --git a/src/components-examples/material/table/table-expandable-rows/table-expandable-rows-example.css b/src/components-examples/material/table/table-expandable-rows/table-expandable-rows-example.css
@@ -7,7 +7,7 @@ tr.example-detail-row {
 }
 
 tr.example-element-row:not(.example-expanded-row):hover {
-  background: #777;
+  background: whitesmoke;
 }
 
 tr.example-element-row:not(.example-expanded-row):active {

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@ tr.example-detail-row {`
`7`	`7`	`}`
`8`	`8`
`9`	`9`	`tr.example-element-row:not(.example-expanded-row):hover {`
`10`		`- background: #777;`
	`10`	`+ background: whitesmoke;`
`11`	`11`	`}`
`12`	`12`
`13`	`13`	`tr.example-element-row:not(.example-expanded-row):active {`