[Bug]: fix some description #37

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Environment

No response

Fast Reproduce Steps

in ob_proxy_config.h
DEF_BOOL(enable_sharding, "false", "if enabled means use beyond trust", CFG_NO_NEED_REBOOT, CFG_SECTION_OBPROXY, CFG_VISIBLE_LEVEL_USER);

sharding has nothing to do with beyond trust.

Actual Behavior

DEF_BOOL(enable_sharding, "false", "if enabled means use logic db", CFG_NO_NEED_REBOOT, CFG_SECTION_OBPROXY, CFG_VISIBLE_LEVEL_USER);

Expected Behavior

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Other Information

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