remove trailing whitespace

This was done using `sed --in-place 's/[[:space:]]\+$//' theories/*.v`.
7 jobs for ci/msammler/remove_whitespace in 16 minutes and 27 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #61102
fp
build-coq.8.10.2

00:04:40

passed #61101
fp-timing
build-coq.8.11.0

00:04:15

passed #61137
fp
build-coq.8.11.dev

00:11:47

passed #61105
fp
build-coq.8.7.2

00:03:54

passed #61104
fp
build-coq.8.8.2

00:03:51

passed #61103
fp
build-coq.8.9.1

00:04:33

failed #61100
fp
build-coq.8.11.dev

00:01:50