Fixed typos in doc

[Dominique Pellé]

Hi

Attached patch fixes a few typos in doc.

Regards
Dominique

[Bram Moolenaar]

Dominique wrote:

> Attached patch fixes a few typos in doc.

Thanks!

--
Wizards had always known that the act of observation changed the thing that
was observed, and sometimes forgot that it also changed the observer too.
Terry Pratchett - Interesting times

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