correct a typo from zeor to zero

[Powerhelmsman]

[opbld33]

OPS Build status updates of commit 0c18a10:

:clock10: Preparing: average preparing time is 38 sec(s)

[opbld34]

OPS Build status updates of commit 0c18a10:

:clock10: Full build: average full build time is 28 sec(s) [calculated from last 1 build(s)]

Note: A full build takes more time than an incremental build. This is the expected behavior of the build system.

[opbld33]

OPS Build status updates of commit 0c18a10:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/CNTK-Library-Managed-API.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[nschonni]

Duplicate of #175