Fix apikey-secret README.md
Following the existing README instructions would result in an error
when the user attempted to create the secret.  This small change
remediates the instruction so that the secret is successfully created.
This function returns access denied, or unlocked depending on whether your header for X-Api-Key matches a secret in the cluster called `secret_api_key`.
-See the [secure secret management guide](../guide/secure_secret_management.md) for more information on secrets.
+See the [secure secret management guide](../../guide/secure_secret_management.md) for more information on secrets.
## Trying the sample:
@@ -11,7 +11,7 @@ See the [secure secret management guide](../guide/secure_secret_management.md) f
$ docker secret remove secret_api_key # make sure we delete any existing secret
# Create a secret with Swarm
-$ echo "secret_value_goes_here" | docker secret create secret_api_key
+$ echo -n "secret_value_goes_here" | docker secret create secret_api_key -
# Deploy this sample with Docker Swarm and attach the secret to it
