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Update mg_next_comma_list_entry.md

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docs/c-api/util.h/mg_next_comma_list_entry.md
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---
A helper function for traversing a comma separated list of values.
It returns a list pointer shifted to the next value, or NULL if the end
It returns a list pointer shifted to the next value or NULL if the end
of the list found.
Value is stored in val vector. If value has form "x=y", then eq_val
vector is initialized to point to the "y" part, and val vector length
The value is stored in a val vector. If the value has a form "x=y", then eq_val
vector is initialised to point to the "y" part, and val vector length
is adjusted to point only to "x".
If list is just a comma separated list of entries, like "aa,bb,cc" then
If the list is just a comma separated list of entries, like "aa,bb,cc" then
`eq_val` will contain zero-length string.
The purpose of this function is to parse comma separated string without