Clarify producer location value type by providing an example: ISO 3166-1 numeric

[13rac1]

Change Description

The type definition of the producer location unsigned integer is vague.

Relative location for purpose of nearest neighbor scheduling

This change adds ISO 3166-1 numeric as an example value type for the cleos system regproducer location field:

`location` _UINT_ - Relative location for purpose of nearest neighbor scheduling, e.g. ISO 3166-1 numeric

A search of this help text currently returns just the cleos source code or EOSIO documentation itself. The value/use of the location value is chain specific, but an example will clarify usage.

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