doc: add distinctive color for code elements inside links

doc: add distinctive color for code elements inside links · nodejs/node@ae70aa3

Original file line number	Diff line number	Diff line change
`@@ -13,7 +13,7 @@`
`13`	`13`	`--red3: #ca5010;`
`14`	`14`	`--green1: #43853d;`
`15`	`15`	`--green2: #5a8147;`
`16`		`---green3: #454545;`
	`16`	`+--green3: #64de64;`
`17`	`17`	`--green4: #99cc7d;`
`18`	`18`	`--green5: #84ba64;`
`19`	`19`	`--gray1: #707070;`
`@@ -50,6 +50,9 @@`
`50`	`50`	`color: var(--grey-smoke);`
`51`	`51`	`background-color: var(--highlight-background-color);`
`52`	`52`	`}`
	`53`	`+.dark-mode a code {`
	`54`	`+color: var(--green3);`
	`55`	`+}`
`53`	`56`
`54`	`57`	`/--------------------- Layout and Typography ----------------------------/`
`55`	`58`	`html {`
`@@ -605,7 +608,8 @@ a code {`
`605`	`608`	`margin-bottom: 0;`
`606`	`609`	`}`
`607`	`610`
`608`		`-#column2 ul li a {`
	`611`	`+#column2 ul li a,`
	`612`	`+#column2 ul li a code {`
`609`	`613`	`color: var(--color-text-nav);`
`610`	`614`	`border-radius: 0;`
`611`	`615`	`}`