[Token] Serveral updates

[shixiedesign]

Mirroring issue carbon-design-system/carbon-website#295

New tokens are added after palette update & component accessibility fixes: carbon-design-system/carbon#3962

$danger

Values

White	G10	G90	G100
Red 60	Red 60	Red 60	Red 60

Usage

3:1 accessible
Danger button background, danger border, error icon

$text-05

Values

White	Gray 10	Gray 90	Gray 100
Gray 60	Gray 60	Gray 50	Gray 50

Usage

Tertiary text, helper text.

$text-02

Values update

White	Gray 10	Gray 90	Gray 100
Gray 80**	Gray 80**	Gray 30	Gray 30
** = changed

Usage update

Remove "helper text"

$support-01

Values unchanged

Usage:

Remove "danger button background"

[aagonzales]

Updated! Available in the next kit update.

Add to v10.6 release notes