docs/language: fix some indentations

9 jobs for v63.2 in 3 minutes and 13 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #347952
build-alpine

00:00:28

passed #347950
build-debian-stable

00:00:39

passed #347951
build-debian-unstable

00:00:27

 
  Test
passed #347957
cppcheck

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passed #347958
luacheck

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passed #347955
system-tests

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passed #347956
system-valgrind-tests

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passed #347953
unit-tests

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passed #347954
unit-valgrind-tests

00:02:34