Add new color attributes to docs

docs/api.rst

@@ -2456,6 +2456,8 @@ of :class:`enum.Enum`.
         Possible attributes for :class:`AuditLogDiff`:
 
         - :attr:`~AuditLogDiff.colour`
+        - :attr:`~AuditLogDiff.secondary_colour`
+        - :attr:`~AuditLogDiff.tertiary_colour`
         - :attr:`~AuditLogDiff.mentionable`
         - :attr:`~AuditLogDiff.hoist`
         - :attr:`~AuditLogDiff.icon`
@@ -2479,6 +2481,8 @@ of :class:`enum.Enum`.
         Possible attributes for :class:`AuditLogDiff`:
 
         - :attr:`~AuditLogDiff.colour`
+        - :attr:`~AuditLogDiff.secondary_colour`
+        - :attr:`~AuditLogDiff.tertiary_colour`
         - :attr:`~AuditLogDiff.mentionable`
         - :attr:`~AuditLogDiff.hoist`
         - :attr:`~AuditLogDiff.icon`
@@ -2496,6 +2500,8 @@ of :class:`enum.Enum`.
         Possible attributes for :class:`AuditLogDiff`:
 
         - :attr:`~AuditLogDiff.colour`
+        - :attr:`~AuditLogDiff.secondary_colour`
+        - :attr:`~AuditLogDiff.tertiary_colour`
         - :attr:`~AuditLogDiff.mentionable`
         - :attr:`~AuditLogDiff.hoist`
         - :attr:`~AuditLogDiff.name`
@@ -4210,6 +4216,24 @@ AuditLogDiff
 
         :type: :class:`Colour`
 
+    .. attribute:: secondary_colour
+                   secondary_color
+
+        The secondary colour of a role.
+
+        See also :attr:`Role.secondary_colour`
+
+        :type: Optional[]:class:`Colour`]
+
+    .. attribute:: tertiary_colour
+                   tertiary_color
+
+        The tertiary colour of a role.
+
+        See also :attr:`Role.tertiary_colour`
+
+        :type: Optional[:class:`Colour`]
+
     .. attribute:: hoist
 
         Whether the role is being hoisted or not.