Add guidance in documentation on how to change the murena.io recovery email
## Summary
There is no information in the documentation about changing the recovery email address of a murena cloud account
## Description
**What is the current behavior?**
In the documentation page about the murena cloud account (https://doc.e.foundation/create-a-murena-cloud-account), we don't have any guidance explaning how to change a recovery email
**What is the improved behavior?**
We add informaiton explaning how a cloud user can change his recovery email
**What does it bring?**
More clarity for the user and the option to change the recovery email address easily.
## Mock-ups
<Provide a mock-up of how it would look with the improvement>
## Examples
<Give the example of what users will be able to accomplish with the improvement>
## Validation
<List test case that will be run to validate that the issue is working as expected>
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