Log Message:
gnucash-docs: update to 4.9.

 4.9   - 19 December 2021
        o Bug 797950 - Reconcilation docs don't mention automatic
		       credit card payment feature.
        o Guide:C: Add a directory with datafiles for faster regeneration of
          images
        o Chapter "Online-Quotes" created.
           Description of the installation and configuration of F::Q (moved
           from Help_ch_Account-Actions-xml).
        o Remove several Autotools remains
        o Drop TravisCI as we are using Github Workflows now.
        o Removed the information of HACKING file from README.
        o Add ghelp to the default target
          At some point in the past ghelp didn't have to be built, as one could
          develop and test simply from the source directory. That is no longer
          the case so perform a build by default if ghelp is enabled.