all: fix typos

Change-Id: Icded6c786b7b185d5aff055f34e0cfe9e521826a
Reviewed-on: https://go-review.googlesource.com/132176
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/internal/ssa/rewrite.go

@@ -1045,7 +1045,7 @@ func needRaceCleanup(sym interface{}, v *Value) bool {
 				// Check for racefuncenter will encounter racefuncexit and vice versa.
 				// Allow calls to panic*
 				default:
-					// If we encounterd any call, we need to keep racefunc*,
+					// If we encountered any call, we need to keep racefunc*,
 					// for accurate stacktraces.
 					return false
 				}

src/cmd/trace/annotations.go

@@ -438,9 +438,8 @@ func (task *taskDesc) complete() bool {
 	return task.create != nil && task.end != nil
 }
 
-// descendents returns all the task nodes in the subtree rooted from this task.
-// TODO: the method name is misspelled
-func (task *taskDesc) decendents() []*taskDesc {
+// descendants returns all the task nodes in the subtree rooted from this task.
+func (task *taskDesc) descendants() []*taskDesc {
 	if task == nil {
 		return nil
 	}

src/cmd/trace/trace.go

@@ -220,7 +220,7 @@ func httpJsonTrace(w http.ResponseWriter, r *http.Request) {
 		params.startTime = task.firstTimestamp() - 1
 		params.endTime = task.lastTimestamp() + 1
 		params.maing = goid
-		params.tasks = task.decendents()
+		params.tasks = task.descendants()
 		gs := map[uint64]bool{}
 		for _, t := range params.tasks {
 			// find only directly involved goroutines
@@ -244,7 +244,7 @@ func httpJsonTrace(w http.ResponseWriter, r *http.Request) {
 		params.mode = modeTaskOriented
 		params.startTime = task.firstTimestamp() - 1
 		params.endTime = task.lastTimestamp() + 1
-		params.tasks = task.decendents()
+		params.tasks = task.descendants()
 	}
 
 	start := int64(0)