Corrects the toAdmin description in the user manual documentation

[felipewind]

A small correction on the toadmin description in the user manual documentation.

This was talked on #237

Local test:

From

This allows you to add fields before an adminstrative message before it is sent out.

To

This allows you to add fields to an administrative message before it is sent out.

[chrjohn]

Hi @felipewind , just stumbled over this... Could you do me a favour and also correct the following while you're at it...

quickfixj/quickfixj-core/src/main/doc/usermanual/usage/application.html

Line 55 in 22b577d

<dd> This callback provides you with a peak at the administrative messages

This should be peek instead of peak.

Thanks in advance. :)

[felipewind]

@chrjohn I did the change you request, from peak to peek.

I'm not sure if I did correctly the git commits. If I messed up the git log just say and I'll correct it.

thanks

[chrjohn]

LGTM, thanks. 👍