Fix typos in docs and comments (#4940)

Ignoring words that would have renamed

- nam. -> name
- ans -> and

sdk/metric/exemplar.go

@@ -63,7 +63,7 @@ func reservoirFunc[N int64 | float64](agg Aggregation) func() exemplar.Reservoir
 			//   This Exemplar reservoir MAY take a configuration parameter for
 			//   the size of the reservoir. If no size configuration is
 			//   provided, the default size MAY be the number of possible
-			//   concurrent threads (e.g. numer of CPUs) to help reduce
+			//   concurrent threads (e.g. number of CPUs) to help reduce
 			//   contention. Otherwise, a default size of 1 SHOULD be used.
 			n = runtime.NumCPU()
 			if n < 1 {

sdk/metric/internal/exemplar/reservoir_test.go

@@ -125,7 +125,7 @@ func ReservoirTest[N int64 | float64](f factory[N]) func(*testing.T) {
 			r.Collect(&dest)
 			assert.Len(t, dest, n, "multiple offers did not fill reservoir")
 
-			// Ensure the collect reset also resets any couting state.
+			// Ensure the collect reset also resets any counting state.
 			for i := 0; i < n+1; i++ {
 				v := N(i)
 				r.Offer(ctx, staticTime, v, nil)

sdk/metric/meter_test.go

@@ -170,7 +170,7 @@ func TestCallbackUnregisterConcurrency(t *testing.T) {
 
 // Instruments should produce correct ResourceMetrics.
 func TestMeterCreatesInstruments(t *testing.T) {
-	// The synchronous measurement methods must ignore the context cancelation.
+	// The synchronous measurement methods must ignore the context cancellation.
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()