Fix CAPI description according to ACR review

Fix CAPI description according to ACR review

0) Reinforce more detail descriptions
1) Decalre return error code appropriately
    CSR_ERROR_DB, CSR_ERROR_FILE_SYSTEM, CSR_ERROR_ENGINE_PERMISSION,
    CSR_ERROR_NOT_SUPPORTED
2) Default message descripted on popup message setters
3) Start with verb on every @brief tags
4) fix typo (e.g., pakcage)
5) Memory management description fixed refered to general guideline
6) Add missing PERMISSIONDENIED return error code list to
   csr_cs_scan_data()
7) Change API name
    csr_cs_malware_get_malware_name() -> csr_cs_malware_get_name()
8) Add description for content screening callback functions

Change-Id: I6bedb74d9ba4ece07576abe50629f6d5cdb9f592
Signed-off-by: Kyungwook Tak <k.tak@samsung.com>