Update typos and add info in unquoted imports and wildcard variables specs. (#4083)

Author: kallentu

accepted/future-releases/unquoted-imports/feature-specification.md

@@ -174,7 +174,7 @@ that still means we need to be able to understand that `foo.widget` and
 `some_model/pb.dart`.
 
 In fact, inside Google's monorepo, dotted package names are idiomatic and
-universally used. If our import shorthand syntax couldn't hangle package names
+universally used. If our import shorthand syntax couldn't handle package names
 with dots in them, no one inside Google would be able to use it.
 
 Instead of `.`, this proposal uses `/`. This is obviously a natural path

accepted/future-releases/wildcard-variables/feature-specification.md

@@ -2,10 +2,12 @@
 
 Author: Bob Nystrom
 
-Status: In-progress
+Status: Accepted
 
 Version 1.6
 
+Experiment Flag: wildcard-variables
+
 ## Motivation
 
 Pattern matching brings a new way to declare variables. Inside patterns, any