wrong SPDX on help pages

[robbiemorrison]

With reference to this help page: https://frictionlessdata.io/blog/2018/03/27/applying-licenses/#provide-additional-license-information

To align with the SPDX standard, please correct: " ODC-PDDL-1.0" → "PDDL-1.0"

More information here: https://spdx.org/licenses/PDDL-1.0.html

HTH R

[lwinfree]

Thanks Robbie, I've fixed it here: frictionlessdata/website#284 (and feel free to make PRs in the future too if you find other errors! 😄 )