Fix spelling issues (mongodb#1451)

(cherry picked from commit 373cda3)

internal/driverutil/hello.go

@@ -28,7 +28,7 @@ const (
  EnvVarFunctionName = "FUNCTION_NAME"
  // EnvVarVercel is the Vercel variable.
  EnvVarVercel = "VERCEL"
- // EnvVarK8s is the K8s veriable.
+ // EnvVarK8s is the K8s variable.
  EnvVarK8s = "KUBERNETES_SERVICE_HOST"
 )
 

internal/test/faas/awslambda/mongodb/main.go

@@ -162,7 +162,7 @@ func handler(ctx context.Context, request events.APIGatewayProxyRequest) (events
  // Driver must switch to polling monitoring when running within a FaaS
  // environment.
  if listener.heartbeatAwaitedCount > 0 {
- return gateway500(), fmt.Errorf("FaaS environment fialed to switch to polling")
+ return gateway500(), fmt.Errorf("FaaS environment failed to switch to polling")
  }
 
  var avgCmdDur float64

mongo/integration/unified/testrunner_operation.go

@@ -21,7 +21,7 @@ import (
 
 // waitForEventTimeout is the amount of time to wait for an event to occur. The
 // maximum amount of time expected for this value is currently 10 seconds, which
-// is the amoutn of time that the driver will attempt to wait between streamable
+// is the amount of time that the driver will attempt to wait between streamable
 // heartbeats. Increase this value if a new maximum time is expected in another
 // operation.
 var waitForEventTimeout = 11 * time.Second

x/mongo/driver/topology/rtt_monitor.go

@@ -42,7 +42,7 @@ type rttMonitor struct {
  mu sync.RWMutex // mu guards samples, offset, minRTT, averageRTT, and averageRTTSet
 
  // connMu guards connecting and disconnecting. This is necessary since
- // disconnecting will await the cancelation of a started connection. The
+ // disconnecting will await the cancellation of a started connection. The
  // use case for rttMonitor.connect needs to be goroutine safe.
  connMu sync.Mutex
  samples []time.Duration