docs/releases/0.99{,9}.md: Fix incorrect md syntax

4 jobs from master in 69 minutes and 19 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Docker Image
passed #100074
pitivi:1.0

00:56:28

passed #100073
pitivi:master

00:50:00

 
  Build
passed #100075
build

00:12:21

 
  Test Results
passed #100076
test-results

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