fix typos, links

src/content/language/concurrency.md

@@ -431,26 +431,26 @@ objects, so they're subject to the same limitations.
 #### Synchronous blocking communication between isolates
 
 There is a limit to the number of isolates that can run in parallel, or *synchronously*.
-This limit doesn't affect the standard *asynchronous* communction between isolates
+This limit doesn't affect the standard *asynchronous* communication between isolates
 via messages in Dart. You can have hundreds of isolates running concurrently
-and making progress. The isolates are scheduled on the CPU in round-robin fashion
+and making progress. The isolates are scheduled on the CPU in round-robin fashion,
 and yield to each other often.
 
 Isolates can only communicate *synchronously* outside of pure Dart,
 using C code via [FFI] to do so. 
-Attempts to do synchronous communication between isolates in FFI calls
+Attempts to perform synchronous communication between isolates in FFI calls
 over the limit may result in deadlock unless special care is taken.
 The limit is not hardcoded to a particular number,
 it's calculated based on the Dart VM heap size available to the Dart application.
 
-To avoid this situation, the C code that does synchronous communication
+To avoid this situation, the C code performing synchronous communication
 needs to leave the current isolate before performing the blocking operation
 and re-enter it before returning to Dart from the FFI call.
 Read about [`Dart_EnterIsolate`] and [`Dart_ExitIsolate`] to learn more.
 
 [FFI]: /interop/c-interop
-[`Dart_EnterIsolate`]: ({{site.repo.dart.sdk}}/blob/c9a8bbd8d6024e419b5e5f26b5131285eb19cc93/runtime/include/dart_api.h#L1254)
-[`Dart_ExitIsolate`]: ({{site.repo.dart.sdk}}/blob/c9a8bbd8d6024e419b5e5f26b5131285eb19cc93/runtime/include/dart_api.h#L1455)
+[`Dart_EnterIsolate`]: {{site.repo.dart.sdk}}/blob/c9a8bbd8d6024e419b5e5f26b5131285eb19cc93/runtime/include/dart_api.h#L1254
+[`Dart_ExitIsolate`]: {{site.repo.dart.sdk}}/blob/c9a8bbd8d6024e419b5e5f26b5131285eb19cc93/runtime/include/dart_api.h#L1455
 
 <a id="web"></a>
 ## Concurrency on the web