[CI] Fix label on CI step "Skipping doc building job"

[ariveradompenciel]

Changes proposed in this pull request

Fixes #1563
Changed echo "Skipping pytest job" to "Skipping doc building job"

Documentation that should be reviewed

N/A

[welcome]

Thanks for opening this pull request! We have detected this is the first time for you to contribute to fMRIPrep. Please check out our contributing guidelines.
We invite you to list yourself as a fMRIPrep contributor, so if your name is not already mentioned, please modify the .zenodo.json file with your data right above Russ' entry. Example:

{
   "name": "Contributor, New FMRIPrep",
   "affiliation": "Department of fMRI prep'ing, Open Science Made-Up University",
   "orcid": "<your id>"
},
{
   "name": "Poldrack, Russell A.",
   "affiliation": "Department of Psychology, Stanford University",
   "orcid": "0000-0001-6755-0259"
},

Of course, if you want to opt-out this time there is no problem at all with adding your name later. You will be always welcome to add it in the future whenever you feel it should be listed.

[jdkent]

looks like the correct print statement is used for pytest and docs

[effigies]

Great! @ariveradompenciel Would you like to add yourself to the .zenodo.json file, as described in #1564 (comment)?