Fix README unavailable code

README.md

@@ -19,7 +19,7 @@ The module is transparently adopted through the automatic addition of `import sk
 ## Status
 
 - SkipLib's Swift symbol files (see [Implementation Strategy](#implementation-strategy)) are nominally complete. They should declare all Swift standard library API. This is difficult to validate, however, so if you find anything missing, please [report it](https://github.com/skiptools/skip-lib/issues) to us.
-- Unimplemented API is appropriately marked with `@available(unavailable, *)` annotations. Skip will generate an error when you attempt to use an unimplemented API.
+- Unimplemented API is appropriately marked with `@available(*, unavailable)` annotations. Skip will generate an error when you attempt to use an unimplemented API.
 - In particular, a significant portion of the [collections](#collections) API is not yet implemented.
 - Unit testing is not comprehensive. See [Tests](#tests) for the current test run status.
 
@@ -29,7 +29,7 @@ We welcome contributions to SkipLib. The Skip product documentation includes hel
 
 The most pressing need is to reduce the amount of unimplemented API. To help fill in unimplemented API in SkipLib:
 
-1. Find unimplemented API. Unimplemented API should be marked with `@available(unavailable, *)` in the Swift symbol files.
+1. Find unimplemented API. Unimplemented API should be marked with `@available(*, unavailable)` in the Swift symbol files.
 1. Write an appropriate Kotlin implementation. See [Implementation Strategy](#implementation-strategy) below. For [collections](#collections) API, make sure your implementation is duplicated for `String` as well.
 1. Write unit tests.
 1. [Submit a PR.](https://github.com/skiptools/skip-lib/pulls)