[3.12] Fix env var typo in perf profiling docs (GH-110404) (#110414)

Fix env var typo in perf profiling docs (GH-110404)

Fix typo in docs
(cherry picked from commit a13620685f68957c965fca89343a0e91f95f1bab)

Co-authored-by: Harmen Stoppels <harmenstoppels@gmail.com>