Update mg_hexdump.md

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int mg_hexdump(const void *buf, int len, char *dst, int dst_len);
---
Generates human-readable hexdump of memory chunk.
Generates a human-readable hexdump of memory chunk.
Takes a memory buffer `buf` of length `len` and creates a hex dump of that
buffer in `dst`. Generated output is a-la hexdump(1).
Return length of generated string, excluding terminating `\0`. If returned
length is bigger than `dst_len`, overflow bytes are discarded.
buffer in `dst`. The generated output is a-la hexdump(1).
Returns the length of generated string, excluding terminating `\0`. If returned
length is bigger than `dst_len`, the overflow bytes are discarded.