Changes in one_kms_cmk and made random plaintext static

Author: mmegs-amzn

examples/src/one_kms_cmk.py

@@ -10,7 +10,7 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
-"""Example showing basic encryption and decryption using one KMS CMK of a value already in memory."""
+"""Example showing basic encryption and decryption of a value already in memory using one KMS CMK."""
 import aws_encryption_sdk