[Sidenav] Component specs

[aweell]

Latest component documentation

Changes

• subtitleFontColor and linkFontColor updated to color-grey-800 (#4d4d4d)
• Updated spacing properties
• Update focus.

There's a PR open for 3.11.0 , any change or fix can be suggested there.

[GomezIvann]

New specs for the Sidenav's links focus included:

• linkFocusColor token added with color value #0095ff.
• outline: 2px solid #0095ff;.
• outline-offset: 1px;.