chore: fixing minor typos

Author: lgraebin

README.md

@@ -163,7 +163,7 @@ $ mix test
 
 ## Release
 
-* Make sure the `CHANGELOG.md` is up-to-date and and reflects the changes for
+* Make sure the `CHANGELOG.md` is up-to-date and reflects the changes for
   the new version.
 * Bump the version here in the `README.md` and in `mix.exs`.
 * Run `git tag v$VERSION` to tag the version that was just published.

lib/aws/client.ex

@@ -204,7 +204,7 @@ defmodule AWS.Client do
   * `retry_opts` - the options to configure retries in case of errors. This uses exponential backoff with jitter.
     * `:max_retries` - the maximum number of retries (plus the initial request). Defaults to `10`.
     * `:base_sleep_time` - the base sleep time in milliseconds. Defaults to `5`.
-    * `:cap_sleep_time`  - the maximum sleep time between atttempts. Defaults to `5_000`.
+    * `:cap_sleep_time`  - the maximum sleep time between attempts. Defaults to `5_000`.
 
   See "FullJitter" at: https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/