feat: add documentation for changes to import/export functionality

operations/import-export.mdx

@@ -50,6 +50,14 @@ For convenience, you can supply `--create-namespace` in order for Flipt to autom
 flipt import --namespace production --create-namespace flipt.yaml
 ```
 
+<Note>
+  In [v1.28.0](https://github.com/flipt-io/flipt/releases/tag/v1.28.0), we introduced some breaking changes to `import`.
+
+  You no longer have to use the `--namespace` or `--create-namespace` flags to import resources into a specific namespace.
+
+  The namespaces are now inferred from the YAML documents themselves. If a namespace your document refers to does not exist in the database, it will be created.
+</Note>
+
 This command supports the `--drop` flag that will drop all of the data in your
 Flipt database tables before importing. This is to ensure that no data
 collisions occur during the import.
@@ -79,7 +87,6 @@ flags:
     name: Blue
   - key: green
     name: Green
-
 ```
 
 You can also export to a file using the `-o filename` or `--output filename`
@@ -95,3 +102,13 @@ Use the flag `--namespace` to export from a different namespace.
 ```yaml
 flipt export --namespace production
 ```
+
+<Note>
+  In [v1.28.0](https://github.com/flipt-io/flipt/releases/tag/v1.28.0), we have extended this functionality to support exporting state from multiple namespaces to a single YAML file.
+
+  The `--namespace` flag is now deprecated, and two new flags now exist.
+
+  The `--namespaces` flag will accept a comma delimited list of namespaces from which you would like to export from.
+
+  The `--all-namespaces flag is a boolean flag which tells export to export all namespaces to the single file you specify, or to standard out by default.
+</Note>