Update proposals/hasCrossSiteAncestor.md

Co-authored-by: Rob Wu <[email protected]>

proposals/hasCrossSiteAncestor.md

@@ -116,7 +116,7 @@ If no `hasCrossSiteAncestor` value is provided it will be populated using the al
 If no value is set for hasCrossSiteAncestor cookies with both true and false values for hasCrossSiteAncestor will be returned. Otherwise, cookies will be returned that match the topLevelSite and the passed value for hasCrossSiteAncestor.
 
 - `cookies.set()`: 
-As described the Abuse Mitigations section, this method will not allow a hasCrossSiteAncestor value of false, if the URL associated with the cookie and the topLevelSite in the partitionKey are not first-party. If this is attempted, an error will be returned. If a `hasCrossSiteAncestor` value is provided without a corresponding `topLevelSite` value, an error will be returned. Additionally, if no `hasCrossSieAncestor` value is provided it will be populated using the algorithim described above.
+As described the Abuse Mitigations section, this method will not allow a hasCrossSiteAncestor value of false, if the URL associated with the cookie and the topLevelSite in the partitionKey are not first-party. If this is attempted, an error will be returned. If a `hasCrossSiteAncestor` value is provided without a corresponding `topLevelSite` value, an error will be returned. Additionally, if no `hasCrossSiteAncestor` value is provided it will be populated using the algorithm described above.
 
 - `cookies.remove()`:
 If no `hasCrossSiteAncestor` value is provided it will be populated using the algorithm described above when determing the cookie to remove. If a `hasCrossSiteAncestor` value is provided without a corresponding `topLevelSite` value, an error will be returned. If `topLevelSite` and `hasCrossSiteAncestor` values are provided, they will be used by the method even if the combination of the values would be invalid.