Clarify mapping of i8 to C char

[mardy]

Describe the issue

The documentation says:

A V i8 is equivalent to C char, or int8_t.

I'm new to V, so I don't really know if this is a bug in the documentation or in V itself, but this mapping would be wrong: char is not guaranteed to be signed (on PowerPC it's unsigned), so the correct mapping would be to signed char.

Links

https://github.com/vlang/v/blob/master/doc/c_and_v_type_interoperability.md

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[huly-for-github]

Connected to Huly®: V_0.6-22402