Make syncShutdown unavailable from async

README.md

@@ -63,7 +63,7 @@ httpClient.get(url: "https://apple.com/").whenComplete { result in
 }
 ```
 
-You should always shut down `HTTPClient` instances you created using `try httpClient.syncShutdown()`. Please note that you must not call `httpClient.syncShutdown` before all requests of the HTTP client have finished, or else the in-flight requests will likely fail because their network connections are interrupted.
+You should always shut down `HTTPClient` instances you created using `try httpClient.shutdown()`. Please note that you must not call `httpClient.shutdown` before all requests of the HTTP client have finished, or else the in-flight requests will likely fail because their network connections are interrupted.
 
 ### async/await examples
 

Sources/AsyncHTTPClient/Docs.docc/index.md

@@ -71,7 +71,7 @@ httpClient.get(url: "https://apple.com/").whenComplete { result in
 }
 ```
 
-You should always shut down ``HTTPClient`` instances you created using ``HTTPClient/syncShutdown()``. Please note that you must not call ``HTTPClient/syncShutdown()`` before all requests of the HTTP client have finished, or else the in-flight requests will likely fail because their network connections are interrupted.
+You should always shut down ``HTTPClient`` instances you created using ``HTTPClient/shutdown()-96ayw()``. Please note that you must not call ``HTTPClient/shutdown()-96ayw()`` before all requests of the HTTP client have finished, or else the in-flight requests will likely fail because their network connections are interrupted.
 
 ### async/await examples
 

Sources/AsyncHTTPClient/HTTPClient.swift

@@ -139,17 +139,29 @@ public class HTTPClient {
                 """)
             case .upAndRunning:
                 preconditionFailure("""
-                Client not shut down before the deinit. Please call client.syncShutdown() when no \
+                Client not shut down before the deinit. Please call client.shutdown() when no \
                 longer needed. Otherwise memory will leak.
                 """)
             }
         }
     }
 
+    #if swift(>=5.7)
     /// Shuts down the client and `EventLoopGroup` if it was created by the client.
+    ///
+    /// This method blocks the thread indefinitely, prefer using ``shutdown()-96ayw``.
+    @available(*, noasync, message: "syncShutdown() can block indefinitely, prefer shutdown()", renamed: "shutdown()")
+    public func syncShutdown() throws {
+        try self.syncShutdown(requiresCleanClose: false)
+    }
+    #else
+    /// Shuts down the client and `EventLoopGroup` if it was created by the client.
+    ///
+    /// This method blocks the thread indefinitely, prefer using ``shutdown()-96ayw``.
     public func syncShutdown() throws {
         try self.syncShutdown(requiresCleanClose: false)
     }
+    #endif
 
     /// Shuts down the client and `EventLoopGroup` if it was created by the client.
     ///