GUIDES REDUX: Misc sphinx-guides formatting clean up

[mheppler]

Despite my efforts in PR #6998 to resolve all formatting warning, in the past 7 days since those fixes were merged, we have another four warnings that managed to creep in the guides somehow.

/dataverse/doc/sphinx-guides/source/developers/deployment.rst:87: WARNING: Mismatch: both interpreted text role prefix and reference suffix.
/dataverse/doc/sphinx-guides/source/developers/testing.rst:140: WARNING: Unknown target name: "dataverse-ansible repo<https://github.com/globaldataversecommunityconsortium/dataverse-ansible/>".
/dataverse/doc/sphinx-guides/source/developers/testing.rst:142: WARNING: Unknown target name: "ec2-create-instance.sh<https://raw.githubusercontent.com/globaldataversecommunityconsortium/dataverse-ansible/master/ec2/ec2-create-instance.sh>".
/dataverse/doc/sphinx-guides/source/developers/testing.rst:143: WARNING: Unknown target name: "main.yml<https://raw.githubusercontent.com/globaldataversecommunityconsortium/dataverse-ansible/master/defaults/main.yml>".

Will provide a bulleted list of changes that resolved these warnings, as well as any other typos and formatting issues I stumble upon while in there.

[mheppler]

WARNINGS

developers/deployment.rst

• (line 87) "Mismatch: both interpreted text role prefix and reference suffix", needed to remove the :download: prefix from "group vars" link since it is not a local file, treating it as a normal link now @donsizemore 4e70dd6

developers/testing.rst

• (line 140) "Unknown target name", needed space between "dataverse-ansible repo" link text and url bracket @donsizemore 4e70dd6
• (line 142) "Unknown target name", needed space between "ec2-create-instance.sh" link text and url bracket @donsizemore 4e70dd6
• (line 143) "Unknown target name", needed space between "main.yml" link text and url bracket @donsizemore 4e70dd6

OTHER MISC CLEAN UP

developers/deployment.rst

• (line 112, 114, 122, 133) fixed formatting of file:// so it doesn't display as a clickable link @donsizemore a12fab6