doc: Fix missing version reference.

6 jobs for <span class="ref-name">210-prescaler-fsm-rework</span> in 12 minutes and 13 seconds (queued for 32 seconds)
Status Job ID Name Coverage
  Precheck
passed #31062
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check_component

00:00:42

 
  Build
passed #31065
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build_doc

00:01:18

passed #31064
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build_driver

00:00:44

passed #31063
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build_ip_and_tests

00:01:51

passed #31066
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build_linux_driver

00:00:41

 
  Test
passed #31067
triggered
test_ip_fast

00:06:56

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