fix: various typos (#813)

aws/SDK_CHANGELOG.md

...me/aws-config/integration-tests/eks-credentials/README.md

aws/rust-runtime/aws-config/src/ecs.rs

aws/rust-runtime/aws-config/src/environment/credentials.rs

aws/rust-runtime/aws-config/src/imds/client.rs

aws/rust-runtime/aws-config/src/json_credentials.rs

aws/rust-runtime/aws-config/src/profile/credentials/repr.rs

aws/rust-runtime/aws-config/src/provider_config.rs

aws/rust-runtime/aws-config/src/sts.rs

aws/rust-runtime/aws-sig-auth/src/middleware.rs

aws/rust-runtime/aws-sigv4/src/http_request/settings.rs

aws/rust-runtime/aws-sigv4/src/http_request/test.rs

...ust-runtime/aws-types/src/credentials/credentials_impl.rs

aws/rust-runtime/aws-types/src/credentials/provider.rs

...tlin/software/amazon/smithy/rustsdk/AwsReadmeDecorator.kt

aws/sdk/examples/config/src/bin/config-helloworld.rs

aws/sdk/examples/kms/src/bin/decrypt.rs

...amples/kms/src/bin/generate-data-key-without-plaintext.rs

aws/sdk/examples/kms/src/bin/generate-data-key.rs

aws/sdk/examples/kms/src/bin/generate-random.rs