v0.2.10.106 docs(man): remove "doi: " text because the \doi mark automatically write it

Refs #34
9 jobs for dev in 6 minutes and 32 seconds (queued for 2 minutes and 13 seconds)
Status Name Job ID Coverage
  Update Packages
passed update_packages_devel #144212

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passed update_packages_oldrel #144213

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passed update_packages_patched #144210

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  Build
passed build_devel #144217

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passed build_oldrel #144219

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passed build_patched #144215

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  Tests
passed check_as_cran_devel #144222

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passed check_as_cran_oldrel #144223

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passed check_as_cran_patched #144221

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