Fix grammar

Author: phischu

libraries/common/io/channel.effekt

@@ -3,7 +3,7 @@ module io/channel
 // Channels
 // --------
 
-/// Must be sended exactly once and waited exactly once
+/// Must sent to exactly once and waited for exactly once
 extern type Channel[T]
 
 namespace channel {

libraries/llvm/io.c

@@ -349,7 +349,7 @@ void c_channel_send(struct Pos channel, struct Pos value) {
             erasePositive(channel);
             erasePositive(value);
             // TODO more graceful panic
-            fprintf(stderr, "ERROR: Channel already sended\n");
+            fprintf(stderr, "ERROR: Channel already used for sending\n");
             exit(1);
             break;
         }
@@ -383,7 +383,7 @@ void c_channel_wait(struct Pos channel, Stack stack) {
             erasePositive(channel);
             eraseStack(stack);
             // TODO more graceful panic
-            fprintf(stderr, "ERROR: Channel already waited\n");
+            fprintf(stderr, "ERROR: Channel already used for waiting\n");
             exit(1);
             break;
         }