Adding release notes for 7.11.0

[corranrogue9]

Adding release notes for 7.11.0

[opbld32]

Docs Build status updates of commit d61bf95:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Odata-docs/changelog/odatalib-7x.md	:white_check_mark:Succeeded	View

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