Update readme

stability/circuit-breaker.md

@@ -6,7 +6,7 @@ wires to heat up and combust, the circuit breaker design pattern is a fail-first
 mechanism that shuts down the circuit, request/response relationship or a
 service in the case of software development, to prevent bigger failures.
 
-**Note:** The words "circuit" and "service" are used synonymously throught this
+**Note:** The words "circuit" and "service" are used synonymously through this
 document.
 
 ## Implementation
@@ -24,22 +24,22 @@ failures.
 package circuit
 
 import (
-	"time"
+    "time"
 )
 
 type State int
 
 const (
-	UnknownState State = iota
-	FailureState
-	SuccessState
+    UnknownState State = iota
+    FailureState
+    SuccessState
 )
 
 type Counter interface {
-	Count(State)
-	ConsecutiveFailures() uint32
-	LastActivity() time.Time
-	Reset()
+    Count(State)
+    ConsecutiveFailures() uint32
+    LastActivity() time.Time
+    Reset()
 }
 ```
 
@@ -49,51 +49,51 @@ Circuit is wrapped using the `circuit.Breaker` closure that keeps an internal op
 It returns a fast error if the circuit has failed consecutively more than the specified threshold.
 After a while it retries the request and records it.
 
-**Note:** Context type is used here to carry deadlines, cancelation signals, and
+**Note:** Context type is used here to carry deadlines, cancellation signals, and
 other request-scoped values across API boundaries and between processes.
 
 ```go
 package circuit
 
 import (
-	"context"
-	"time"
+    "context"
+    "time"
 )
 
 type Circuit func(context.Context) error
 
 func Breaker(c Circuit, failureThreshold uint32) Circuit {
-	cnt := NewCounter()
+    cnt := NewCounter()
 
-	return func(ctx context) error {
-		if cnt.ConsecutiveFailures() >= failureThreshold {
-			canRetry := func(cnt Counter) {
-				backoffLevel := Cnt.ConsecutiveFailures() - failureThreshold
+    return func(ctx context) error {
+        if cnt.ConsecutiveFailures() >= failureThreshold {
+            canRetry := func(cnt Counter) {
+                backOffLevel := Cnt.ConsecutiveFailures() - failureThreshold
 
-				// Calculates when should the circuit breaker resume propagating requests
-				// to the service
-				shouldRetryAt := cnt.LastActivity().Add(time.Seconds * 2 << backoffLevel)
+                // Calculates when should the circuit breaker resume propagating requests
+                // to the service
+                shouldRetryAt := cnt.LastActivity().Add(time.Seconds * 2 << backOffLevel)
 
-				return time.Now().After(shouldRetryAt)
-			}
+                return time.Now().After(shouldRetryAt)
+            }
 
-			if !canRetry(cnt) {
-				// Fails fast instead of propagating requests to the circuit since
-				// not enough time has passed since the last failure to retry
-				return ErrServiceUnavailable
-			}
-		}
+            if !canRetry(cnt) {
+                // Fails fast instead of propagating requests to the circuit since
+                // not enough time has passed since the last failure to retry
+                return ErrServiceUnavailable
+            }
+        }
 
-		// Unless the failure threshold is exceeded the wrapped service mimics the
-		// old behavior and the difference in behavior is seen after consecutive failures
-		if err := c(ctx); err != nil {
-			cnt.Count(FailureState)
-			return err
-		}
+        // Unless the failure threshold is exceeded the wrapped service mimics the
+        // old behavior and the difference in behavior is seen after consecutive failures
+        if err := c(ctx); err != nil {
+            cnt.Count(FailureState)
+            return err
+        }
 
-		cnt.Count(SuccessState)
-		return nil
-	}
+        cnt.Count(SuccessState)
+        return nil
+    }
 }
 ```