Add ? for madeOptional (#3820)

`madeOptional` implies the current property is optional, so adding the
missing `?`

.chronus/changes/version_optional-2024-6-11-17-40-39.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: internal
+packages:
+  - "@typespec/versioning"
+---
+
+Updated doc of madeOptional

docs/libraries/versioning/reference/decorators.md

@@ -68,7 +68,7 @@ model Foo {
   name: string;
 
   @madeOptional(Versions.v2)
-  nickname: string;
+  nickname?: string;
 }
 ```
 

packages/versioning/README.md

@@ -118,7 +118,7 @@ model Foo {
   name: string;
 
   @madeOptional(Versions.v2)
-  nickname: string;
+  nickname?: string;
 }
 ```
 

packages/versioning/generated-defs/TypeSpec.Versioning.ts

@@ -171,7 +171,7 @@ export type RenamedFromDecorator = (
  * model Foo {
  *   name: string;
  *   @madeOptional(Versions.v2)
- *   nickname: string;
+ *   nickname?: string;
  * }
  * ```
  */

packages/versioning/lib/decorators.tsp

@@ -155,7 +155,7 @@ extern dec renamedFrom(
  * model Foo {
  *   name: string;
  *   @madeOptional(Versions.v2)
- *   nickname: string;
+ *   nickname?: string;
  * }
  * ```
  */