docs: clarify mem.Allocator.reallocFn
docs: clarify mem.Allocator.reallocFn

zig-lang/zig,raulgrell/zig,andrewrk/zig,andrewrk/zig,zig-lang/zig,Dimenus/zig,raulgrell/zig,Dimenus/zig,zig-lang/zig,raulgrell/zig,Dimenus/zig,raulgrell/zig,raulgrell/zig