fix(examples): Task_Join -> Task_Wait to match stdlib API

examples/channel.bux

@@ -1,5 +1,5 @@
 import Std::Io::{PrintLine, PrintInt};
-import Std::Task::{Task_Join, TaskHandle};
+import Std::Task::{Task_Wait, TaskHandle};
 import Std::Channel::{Channel, Channel_New, Channel_SendInt, Channel_RecvInt, Channel_Close};
 
 func Producer(chPtr: *Channel<int>) {
@@ -31,7 +31,7 @@ func Main() -> int {
     let ch: Channel<int> = Channel_New<int>(3);
     let p: *void = spawn Producer(&ch);
     let c: *void = spawn Consumer(&ch);
-    Task_Join(TaskHandle { handle: p });
-    Task_Join(TaskHandle { handle: c });
+    Task_Wait(TaskHandle { handle: p });
+    Task_Wait(TaskHandle { handle: c });
     return 0;
 }

examples/concurrency.bux

@@ -1,6 +1,6 @@
 import Std::Io::{PrintLine, PrintInt};
 import Std::Task::TaskHandle;
-import Std::Task::Task_Join;
+import Std::Task::Task_Wait;
 import Std::Channel::Channel;
 
 func Worker(arg: *void) -> *void {
@@ -10,7 +10,7 @@ func Worker(arg: *void) -> *void {
 
 func Main() -> int {
     let handle: *void = spawn Worker();
-    Task_Join(TaskHandle { handle: handle });
+    Task_Wait(TaskHandle { handle: handle });
     PrintLine("Thread finished");
     return 0;
 }

examples/sync.bux

@@ -1,5 +1,5 @@
 import Std::Io::{PrintLine, PrintInt};
-import Std::Task::{Task_Join, TaskHandle};
+import Std::Task::{Task_Wait, TaskHandle};
 import Std::Sync::{Mutex, Mutex_New, Mutex_Lock, Mutex_Unlock};
 
 struct Counter {
@@ -25,8 +25,8 @@ func Main() -> int {
     let a: *void = spawn Incrementer(&counter);
     let b: *void = spawn Incrementer(&counter);
 
-    Task_Join(TaskHandle { handle: a });
-    Task_Join(TaskHandle { handle: b });
+    Task_Wait(TaskHandle { handle: a });
+    Task_Wait(TaskHandle { handle: b });
 
     PrintLine("Counter:");
     PrintInt(counter.value);