Add @identity to the list of possible values for the @identityKey argument of Table and AdvancedTable (#2706)

Author: didoo

website/docs/components/table/advanced-table/partials/code/component-api.md

@@ -104,7 +104,7 @@ The Advanced Table component itself is where most of the options will be applied
   <C.Property @name="caption" @type="string">
     Adds a (non-visible) caption for users with assistive technology. If set on a sortable table, the provided caption is paired with the automatically generated sorted message text.
   </C.Property>
-  <C.Property @name="identityKey" @type="'none'|string" @default="@identity">
+  <C.Property @name="identityKey" @type="'@identity'|'none'|string" @default="@identity">
     Option to [specify a custom key](https://api.emberjs.com/ember/release/classes/Ember.Templates.helpers/methods/each?anchor=each#:~:text=%3C/ul%3E-,Specifying%20Keys,-In%20order%20to) to the `each` iterator. If `identityKey="none"`, this is interpreted as an `undefined` value for the `@identity` key option.
   </C.Property>
   <C.Property @name="sortedMessageText" @type="string" @default="Sorted by (label), (asc/desc)ending">

website/docs/components/table/table/partials/code/component-api.md

@@ -106,7 +106,7 @@ The Table component itself is where most of the options will be applied. However
   <C.Property @name="caption" @type="string">
     Adds a (non-visible) caption for users with assistive technology. If set on a sortable table, the provided table caption is paired with the automatically generated sorted message text.
   </C.Property>
-  <C.Property @name="identityKey" @type="'none'|string" @default="@identity">
+  <C.Property @name="identityKey" @type="'@identity'|'none'|string" @default="@identity">
     Option to [specify a custom key](https://api.emberjs.com/ember/release/classes/Ember.Templates.helpers/methods/each?anchor=each#:~:text=%3C/ul%3E-,Specifying%20Keys,-In%20order%20to) to the `each` iterator. If `identityKey="none"`, this is interpreted as an `undefined` value for the `@identity` key option.
   </C.Property>
   <C.Property @name="sortedMessageText" @type="string" @default="Sorted by (label), (asc/desc)ending">