removed some outdated differences between parser and spec

specification.md

@@ -4,8 +4,6 @@ There are a few differences between the [Power Query / M Language Specification]
 
 ## Where the Power Query parser differs from the specification
 
--   An additional primitive type named `action` exists.
--   The `field-specification` construct requires an `identifier`. Instead `identifer` is replaced with `generalized-identifier`.
 -   An additional match of `primary-expression` is added on the following tokens: `@`, `identifier`, or `left-parenthesis`.
 -   The `identifier` construct was changed so that after a period instead of matching `identifier-start-character` it now matches `identifier-part-character`.
 -   The `generalized-identifier` construct was changed so that `identifier-start-character` was replaced with `identifier-part-character`. It also accepts quoted identifiers.