Change: GMP doc: be more accurate about user SOURCES

[mattmundell]

What

In GMP CREATE_USER and MODIFY_USER, clarify that SOURCES may contain at most one SOURCE.

Why

Clearer.

References

SOURCES were restricted to a single SOURCE when user management was moved into the db in aacc589.

Example

Single source is OK:

$ o m m '<modify_user><name>test7</name><password>test</password><sources><source>file</source></sources></modify_user>'
<modify_user_response status="200" status_text="OK" />

Multiple sources is an error:

$ o m m '<modify_user><name>test7</name><password>test</password><sources><source>file</source><source>ldap_connect</source></sources></modify_user>'
<modify_user_response status="400" status_text="Error in SOURCES" />

[github-actions]

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