kvs_init_* not documented

[deponty]

Location (Korea, USA, China, India, etc.)
USA

Describe the bug
A clear and concise description of what the bug is.

The KV_ADI spec does not document anything related to initialization functions, though they are clearly used in the sample code and in the kvs_api.h

The comments in kvs_api.h don't tell me anything about what the impact of these initialization variables in kv_init_options do.

To Reproduce
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Expected behavior
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Screenshots
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System environment (please complete the following information)

• Firmware version :
• Number of SSDs :
• OS & Kernel version [e.g., Ubuntu 16.04 Kernel v4.9.5]:
• GCC version [e.g., gcc v5.0.0] :
• kvbench version if kvbench runs [e.g., v0.6.0]:
• KV API version [e.g., v0.6.0]
• User driver version :
• Driver [Kernel or user driver or emulator] :

Workload

• number of records or data size
• Workload(insert, mixed workload, etc.) [e.g., sequential or random insert, or 50% Read & 50% write]
• key size :
• value size :
• operation option if available [e.g., sync or async mode] :

Additional context
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[kvssd-support]

We will update the Spec as needed in the next release

[kvssd-support]

Please use the latest repo for fix