gnucash-docs master: Fix typo in build script

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/069cbfce (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/1723d8a2 (commit)



commit 069cbfceeca1462dc8c0efd5c7ca3ab5679903c3
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Sun Aug 21 22:26:39 2022 +0200

    Fix typo in build script



Summary of changes:
 cmake/AddXdgHelpTarget.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)