CFn: document NoEcho behaviour (#1653)

Co-authored-by: Roman Inflianskas <[email protected]>

Author: simonrw

content/en/user-guide/aws/cloudformation/index.md

@@ -150,6 +150,13 @@ Currently, support for `UPDATE` operations on resources is limited.
 Prefer stack re-creation over stack update at this time.
 {{< /callout >}}
 
+{{< callout >}}
+Currently, support for `NoEcho` parameters is limited.
+Parameters will be masked only in the `Parameters` section of responses to `DescribeStacks` and `DescribeChangeSets` requests.
+This might expose sensitive information.
+Please exercise caution when using parameters with `NoEcho`.
+{{< /callout >}}
+
 ### Intrinsic Functions
 
 | Intrinsic Function | Supported | Explanation                                                  |

content/en/user-guide/aws/ec2/index.md

@@ -172,7 +172,7 @@ Run the following command to test the Python Web Server:
 
 {{< command >}}
 $ curl 172.17.0.4:8000
-# Or, you can run:
+# Or, you can run
 $ curl 127.0.0.1:29043
 {{< /command >}}