fix warnings in docs builds

[anarcat]

A clean build of the docs yielded the following errors:

reading sources... [100%] updates                                               
/home/anarcat/src/internetarchive/docs/source/jq.rst:4: WARNING: Duplicate explicit target name: "jq".
/home/anarcat/src/internetarchive/docs/source/jq.rst:229: WARNING: Title level inconsistent:

TODO
____
looking for now-outdated files... none found
pickling environment... done
checking consistency... /home/anarcat/src/internetarchive/docs/source/jq.rst: WARNING: document isn't included in any toctree
/home/anarcat/src/internetarchive/docs/source/metadata.rst: WARNING: document isn't included in any toctree

This patch adds the missing documents to the toctree and fixes the todo title.

[jjjake]

metadata.rst should be deleted. Those docs have moved to https://archive.org/services/docs/api/metadata-schema/index.html (i.e. they will no longer be a part of the internetarchive library/CLI documentation). BTW, we're in the process of transitioning from reathedocs.io to https://archive.org/services/docs/api/internetarchive/docs/source/index.html (I'll put a redirect in place when we're ready. There's still a bit of work to do, e.g. automating the build process, etc.).

jq.rst can be added (This was a first pass at documenting the use of jq with ia, but it looks good to me. I'll continue to work on it.).

If you'd prefer I make the changes just let me know, otherwise feel free to delete metadata.rst from the TOC as well as the file and I'll merge the PR.

Thanks again!

[anarcat]

If you'd prefer I make the changes just let me know, otherwise feel free to delete metadata.rst from the TOC as well as the file and I'll merge the PR.

Please do go ahead. :) But I think there should be some cross-refs to some metadata docs in the cli page at least and i liked how it was simple and clearly stated... the metadata schema isn't as well-formatted, from what i can tell.