Add FS-1016 (#63)

Describes the removal of reserved keywords per
https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1016-unreserve-keywords.md

Author: roboz0r

spec/lexical-analysis.md

@@ -158,14 +158,22 @@ The following identifiers are reserved for future use:
 
 ```fsgrammar
 token reserved-ident-keyword =
-    atomic break checked component const constraint constructor
-    continue eager fixed fori functor include
-    measure method mixin object parallel params process protected pure
-    recursive sealed tailcall trait virtual volatile
+    break checked component const constraint
+    continue fixed fori include
+    mixin parallel params process protected pure
+    sealed tailcall trait virtual
 ```
 
 A future revision of the F# language may promote any of these identifiers to be full keywords.
 
+The following identifiers were previously reserved but can now be used:
+
+```fsgrammar
+token ident =
+    atomic constructor eager functor measure method
+    object recursive volatile
+```
+
 The following token forms are reserved, except when they are part of a symbolic keyword ([§](lexical-analysis.md#symbolic-keywords)).
 
 ```fsgrammar
@@ -388,7 +396,7 @@ token unativeint = ( int | xint ) 'un'           For example, 34un
 token int64 = ( int | xint ) 'L'                 For example, 34L
 token uint64 = ( int | xint ) 'UL'               For example, 34UL
              | ( int | xint ) 'uL'               For example, 34uL
- 
+
 token float =
     int . int?
     int (. int?)? (e|E) (+|-)? int

spec/rfc-status.md

@@ -25,7 +25,7 @@
 | F# 4.1 | FS-1013 | [Enable Reflection Functionality on Portable Profiles](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1013-enable-reflection-functionality-on-portable-profiles.md) | |
 | F# 4.1 | FS-1014 | [Struct Discriminated Unions](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1014-struct-discriminated-unions.md) | |
 | F# 4.1 | FS-1015 | [Support for fixed](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1015-support-for-fixed.md) | |
-| F# 4.1 | FS-1016 | [Unreserve Keywords](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1016-unreserve-keywords.md) | |
+| F# 4.1 | FS-1016 | [Unreserve Keywords](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1016-unreserve-keywords.md) | [completed](https://github.com/fsharp/fslang-spec/pull/63) |
 | F# 4.1 | FS-1017 | [Fix SRTP Constraint Parsing](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1017-fix-srtp-constraint-parsing.md) | |
 | F# 4.1 | FS-1018 | [Adjust Extensions Method Scope](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1018-adjust-extensions-method-scope.md) | |
 | F# 4.1 | FS-1019 | [Implicitly Add the Module Suffix](https://github.com/fsharp/fslang-design/tree/main/FSharp-4.1/FS-1019-implicitly-add-the-module-suffix.md) | |