Minor issue with documentation (reparse/doc/source/howto.rst)

[jfthuong]

There are few issues in documentation (https://github.com/andychase/reparse/blob/master/doc/source/howto.rst):

1. Incorrect regex for area code [+]([0-9] \d{2}) - (\d{3}) - (\d{4}) => [+]([0-9] \d{3}) - (\d{3}) - (\d{4})
2. Misleading examples of outputs in section 5: description indicates direct output but implementation suggests output of first function being an array

def senthill((AreaCode, Prefix, Body):
    return Phone(area_code=AreaCode, prefix=Prefix, body=Body, fax=False)

def phone(p):
    return p[0]

3. "basic phone" returns a list and "fax phone" returns the first element: this does not match with section 6

def basic_phone(p):
    return p

def fax_phone(p):
    return p[0]._replace(fax=True)

...

print(phone_parser('+974-584-5656'))
# => [phone(area_code='974', prefix='584', body='5656', fax=False)]
print(phone_parser('Fax: +974-584-5656'))
# => [phone(area_code='974', prefix='584', body='5656', fax=True)]