revision of example in <byline>

[martinascholger]

This issue was spotted by @martindholmes (
https://lists.tei-c.org/pipermail/tei-council/2020-November/026587.html) when reviewing the "copia" examples. The last example of the <byline> specs in French needs revision.

The comma should be outside the <docAuthor>, and there should be a space after docteur.

<byline>Par le docteur<docAuthor>Martin Becanus,</docAuthor> au tome 
troisiesme de ses
  opuscules</byline>

[lb42]

Could also argue for including "le docteur" as part of the docAuthor

[HelenaSabel]

Typo corrected with 86dc263.
The contents of the named entity in relation to “le docteur” were not explicitly addressed.