chore: Misc codegen fixes (#732)

* Add .sorted() before comment codegen for errors.

* Fix extra spacing in deprecated trait message codegen.

---------

Co-authored-by: Sichan Yoo <[email protected]>

Author: sichanyoo

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/ServiceGenerator.kt

@@ -79,7 +79,7 @@ class ServiceGenerator() {
                 writer.writeSingleLineDocs { write("- Throws: One of the exceptions listed below __Possible Exceptions__.") }
                 writeEmptyLine()
                 writer.writeSingleLineDocs { write("__Possible Exceptions:__") }
-                op.getErrors(service).forEach { error ->
+                op.getErrors(service).sorted().forEach { error ->
                     writer.writeDocs("\\- \\`${error.name}\\` : ${retrieveMemberShapeDoc(error.toShapeId(), model)}")
                 }
             }

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/SwiftWriter.kt

@@ -228,7 +228,8 @@ class SwiftWriter(private val fullPackageName: String, swiftImportContainer: Swi
                 message.append(deprecatedTrait.message.get())
             }
             if (sincePresent) {
-                message.append(" API deprecated since ${deprecatedTrait.since.get()}")
+                val conditionalSpace = if (messagePresent) " " else ""
+                message.append("${conditionalSpace}API deprecated since ${deprecatedTrait.since.get()}")
             }
 
             if (messagePresent || sincePresent) {

smithy-swift-codegen/src/test/kotlin/StructureGeneratorTests.kt

@@ -456,7 +456,7 @@ public struct MyError: ClientRuntime.ModeledError, ClientRuntime.ServiceError, C
         Assertions.assertNotNull(structWithDeprecatedTrait)
         structContainsDeprecatedTrait = """
         extension ExampleClientTypes {
-            @available(*, deprecated, message: " API deprecated since 2019-03-21")
+            @available(*, deprecated, message: "API deprecated since 2019-03-21")
             public struct StructSincePropertySet {
         """.trimIndent()
         structWithDeprecatedTrait.shouldContain(structContainsDeprecatedTrait)
@@ -480,7 +480,7 @@ public struct MyError: ClientRuntime.ModeledError, ClientRuntime.ServiceError, C
             public var intVal: Swift.Int?
             @available(*, deprecated)
             public var string: Swift.String?
-            @available(*, deprecated, message: " API deprecated since 2019-03-21")
+            @available(*, deprecated, message: "API deprecated since 2019-03-21")
             public var structSincePropertySet: ExampleClientTypes.StructSincePropertySet?
             @available(*, deprecated, message: "This shape is no longer used. API deprecated since 1.3")
             public var structWithDeprecatedTrait: ExampleClientTypes.StructWithDeprecatedTrait?