manual patch

[François Dumont]

Hi

    As I plan to work a little bit on the libstdc++ project I first read 
the manual. There are some typo in it so here is the patch. The only 
noticeable modifications are:
- bitset.html: I remove a 'recent' word that is not in sync with the 
1999 year of the referenced article
- associative.html: The doc was talking about an associative container 
entry at end(), there is no entry 'at' end() so I replace with 'before' 
end()
- locales.html: I only fix a useless 'is' word but IMO the German 
reference could be remove too, numpunct gives the thousand separator for 
any locale not only the German one.
- bk01pt08ch19.html: The answer to the question about the overhead of 
vector iterator not being pointer is simply 'Very little'. I was rather 
frustrated by such an answer. Very little is not none so the answer 
should contain what this very little is. I added 'limited to compilation 
process', am I right ? We could even add that there is no runtime 
overhead to be very clear as it is what users might be afraid of.

    I haven't done a ChangeLog entry, does this patch deserve one ?

Bests
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