Fix typo (#541)

Invocation instead of invokation

_articles/send/send-cli.md

@@ -74,7 +74,7 @@ bw send template send.text | jq ".name=\"My First Send\" | .text.text=\"Secrets
 ```
 
 {% callout success %}
-Notice in the 2nd example that the jq invokation must be wrapped in double quotes (`" "`) and use escapes (`\`) for each filter due to a nested `date` variable that configures a `.deletionDate` in the Send.
+Notice in the 2nd example that the jq invocation must be wrapped in double quotes (`" "`) and use escapes (`\`) for each filter due to a nested `date` variable that configures a `.deletionDate` in the Send.
 {% endcallout %}
 
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