aws/retry: Fixup documentation typos(#1698)

* Modify the outline of aws/retry/doc.go
* Correct obvious typological errors in aws/retry/doc.go

aws/retry/doc.go

@@ -2,9 +2,9 @@
 //
 // Retryer Interface and Implementations
 //
-// This packages defines Retryer interface that is used to either implement custom retry behavior
-// or to extend the existing retry implementations provided by the SDK. This packages provides a single
-// retry implementations: Standard.
+// This package defines Retryer interface that is used to either implement custom retry behavior
+// or to extend the existing retry implementations provided by the SDK. This package provides a single
+// retry implementation: Standard.
 //
 // Standard
 //
@@ -33,7 +33,7 @@
 // value.
 //
 // You can configure the standard retryer implementation to fit your applications by constructing a standard retryer
-// using the NewStandard function, and providing one more functional arguments that mutate the StandardOptions
+// using the NewStandard function, and providing one more functional argument that mutate the StandardOptions
 // structure. StandardOptions provides the ability to modify the token bucket rate limiter, retryable error conditions,
 // and the retry delay policy.
 //
@@ -71,7 +71,7 @@
 //                          standard retryer.
 //
 //   IsErrorRetryableFunc - Can be used to wrap a function to satisfy the IsErrorRetryable interface. For example,
-//                          this can be used to extend the standard retryer to add additional logic ot determine if a
+//                          this can be used to extend the standard retryer to add additional logic to determine if an
 //                          error should be retried.
 //
 //   IsErrorTimeoutFunc   - Can be used to wrap a function to satisfy IsErrorTimeout interface. For example,