SWI-1234 Update Create Message Guide (#1024)

Author: ckoegel

site/docs/messaging/createMessage.mdx

@@ -52,7 +52,7 @@ Sending a text message is as simple as making an API <Highlight color="#079CEE">
 
 * Who the message is `from` (a Bandwidth number)
 * Who the message is `to` (a PSTN number)
-* The `text` of the message - what you want to say
+* The `text` of the message - what you want to say. See our [FAQ](https://support.bandwidth.com/hc/en-us/articles/360010235373-What-are-Bandwidth-s-SMS-character-limits-and-concatenation-practices-) for SMS character limits and concatenation practices.
 * The messaging `applicationId` associated with the `from` number
 * Your basic auth `username` and `password` in the `Authorization` header
 * Optional: A `media` url that links to an attachment/file you wish to send