Fix documentation for Remote Agents template

[ekzarov]

Prerequisites

• I am running the latest version of the AEA Framework.
• I checked the documentation and found no answer to my problem.
• I checked the existing issues to make sure my problem has not already been reported.
• I have read the code of conduct before creating this issue.

Expected Behavior

Change documentation according to latest implemention.
https://docs.fetch.ai/uAgents/remote-agents/#alice

Here should be a 'text' in docs.

Current Behavior

Run agent which tries to send message on interval to another address.
Gives error: exception=ValidationError(model='Message', errors=[{'loc': ('text',), 'msg': 'field required', 'type': 'value_error.missing'}]

To Reproduce

No response

Context

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Failure Logs

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