[xml] Spelling mistake

[Justin Fletcher <justin fletcher ntlworld com>]

Hiya,

Tiny spelling mistake thing in a few files:

DOCBparse.c, HTMLparser.c, and parser.c all have lines :

   ctxt->sax->error(ctxt->userData, "DOCTYPE unproperly terminated\n");

'unproperly' should be 'improperly'.

English being a stupid language for irregular verbs.

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