minor document updates (#286)

* minor document updates

Author: gammazero

README.md

@@ -15,7 +15,7 @@ cmds offers tools for describing and calling commands both locally and remotely,
 
 ## Documentation
 
-https://godoc.org/github.com/ipfs/go-ipfs-cmds
+https://pkg.go.dev/github.com/ipfs/go-ipfs-cmds
 
 ## Contribute
 
@@ -30,4 +30,3 @@ This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/c
 ## License
 
 MIT
-

command_test.go

@@ -373,9 +373,9 @@ func TestEmitterExpectError(t *testing.T) {
 
 	switch re.errorCount {
 	case 0:
-		t.Errorf("expected SetError to be called")
+		t.Errorf("expected CloseWithError to be called")
 	case 1:
 	default:
-		t.Errorf("expected SetError to be called once, but was called %d times", re.errorCount)
+		t.Errorf("expected CloseWithError to be called once, but was called %d times", re.errorCount)
 	}
 }

doc.go

@@ -60,10 +60,8 @@ from.
 Responses have a method Next() that returns the next
 emitted value and an error value. If the last element has been
 received, the returned error value is io.EOF. If the
-application code has sent an error using SetError, the error
-ErrRcvdError is returned on next, indicating that the caller
-should call Error(). Depending on the reponse type, other
-errors may also occur.
+application's code encounters a fatal error, it will call CloseWithError,
+and that the error value will be returned via subsiquent calls to Next().
 
 # Pipes
 

responseemitter.go

@@ -41,7 +41,6 @@ type ResponseEmitter interface {
 	CloseWithError(error) error
 
 	// SetLength sets the length of the output
-	// err is an interface{} so we don't have to manually convert to error.
 	SetLength(length uint64)
 
 	// Emit sends a value.
@@ -71,6 +70,7 @@ func Copy(re ResponseEmitter, res Response) error {
 	}
 }
 
+// EmitChan reads a value from a channel and send that value to re.
 func EmitChan(re ResponseEmitter, ch <-chan interface{}) error {
 	for v := range ch {
 		err := re.Emit(v)