FlashDB

[doc] Update the CN doc

[kvdb] 修复在align_write中 向下对齐等于0依然调用写入flash的现象 (#370)

[demo][linux] Change an ordinary lock to a recursive lock (#339)

[fdb] Rename "fdb_cfg.h" to "fdb_cfg_template.h" in inc folder (#338)

[fdb] Fixed a bug with reversed arguments to the fwrite and fread functions for LIBC mode. (#333)