Increase size of retry utilities image
* The functions are used as shown in the diagram below. This is the exponential
* backoff with jitter loop:
*
- * @image html retry_utils_flow.png width=25%
+ * @image html retry_utils_flow.png width=60%
*
* The following steps give guidance on implementing the Retry Utils. An example
* implementation of the Retry Utils for a POSIX platform can be found in file
