make variable names a bit more consistent between Coq and LaTeX

6 jobs for master in 13 minutes and 48 seconds (queued for 21 seconds)
Status Job ID Name Coverage
  Build
passed #34212
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build-coq.8.10.dev

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passed #34216
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build-coq.8.7.2

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build-coq.8.8.2

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passed #34214
fp-timing
build-coq.8.9.0

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passed #34213
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build-coq.8.9.1

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passed #34211
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build-coq.dev

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