Add swhid bibtex

Small MR with small fixes/changes:

• Fix citation API doc example
• Add swhid in bibTeX citation

Jenkins job DWAPPS/gitlab-builds #1146 failed in 10 min.
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added 25 commits

• cff1b4dd...eda0cafa - 23 commits from branch swh/devel:master
• 34cd30a2 - Fix citation api doc example
• 3b317b54 - Add swhid in bibTeX citation

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Jenkins job DWAPPS/gitlab-builds #1147 failed in 10 min.
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@jenkins build retry

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Jenkins job DWAPPS/gitlab-builds #1148 succeeded in 9 min 53 sec.
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Jenkins job DWAPPS/gitlab-builds #1149 succeeded in 9 min 38 sec.
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added 1 commit

• 17e7f99b - Fix API doc

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resolved all threads

Jenkins job DWAPPS/gitlab-builds #1159 failed in 6 min 28 sec.
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Jenkins job DWAPPS/gitlab-builds #1160 failed in 6 min 17 sec.
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approved this merge request

Jenkins job DWAPPS/gitlab-builds #1161 succeeded in 9 min 24 sec.
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Thanks again!

merged