[docs] format specicifation language missing character in example

[Anthon van der Neut]

I was using the examples of the usage of .format as an extra testcase 
for pyjamas and found that a '.' was missing in

http://docs.python.org/library/string.html#formatspec

section 7.1.3.2 Format Examples
subsection 'Expressing a percentage':

>>>  'Correct answers: {:.2%}.'.format(points/total)
'Correct answers: 88.64%'

There should be a '.' (dot) before the closing quote in the last line.

Regards
Anthon
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