[SE-0461] Update table of contents.

Author: hborla

proposals/0461-async-function-isolation.md

@@ -28,20 +28,23 @@ async function always switches off of an actor to run.
 - [Detailed design](#detailed-design)
   - [The `@execution` attribute](#the-execution-attribute)
     - [`@execution(caller)` functions](#executioncaller-functions)
-    - [`@execution(concurrent)` functions](#executionconcurrent-functions)
+    - [`@concurrent` functions](#concurrent-functions)
   - [Task isolation inheritance](#task-isolation-inheritance)
   - [`#isolation` macro expansion](#isolation-macro-expansion)
   - [Isolation inference for closures](#isolation-inference-for-closures)
   - [Function conversions](#function-conversions)
+    - [Non-`@Sendable` function conversions](#non-sendable-function-conversions)
+  - [Region isolation rules](#region-isolation-rules)
   - [Executor switching](#executor-switching)
+  - [Dynamic actor isolation APIs in async contexts](#dynamic-actor-isolation-apis-in-async-contexts)
   - [Import-as-async heuristic](#import-as-async-heuristic)
 - [Source compatibility](#source-compatibility)
 - [ABI compatibility](#abi-compatibility)
 - [Implications on adoption](#implications-on-adoption)
 - [Alternatives considered](#alternatives-considered)
   - [Changing isolation inference behavior to implicitly capture isolated parameters](#changing-isolation-inference-behavior-to-implicitly-capture-isolated-parameters)
-  - [Use `nonisolated` instead of a separate `@execution(concurrent)` attribute](#use-nonisolated-instead-of-a-separate-executionconcurrent-attribute)
-  - [Use "isolation" terminology instead of "execution"](#use-isolation-terminology-instead-of-execution)
+  - [Use `nonisolated` instead of a separate `@concurrent` attribute](#use-nonisolated-instead-of-a-separate-concurrent-attribute)
+  - [Alternative syntax choices](#alternative-syntax-choices)
   - [Deprecate `nonisolated`](#deprecate-nonisolated)
   - [Don't introduce a type attribute for `@execution`](#dont-introduce-a-type-attribute-for-execution)
 - [Revisions](#revisions)