fix(influxdb3): correct wal-snapshot-size example from 100MB to 100 (#7066)

* Initial plan

* fix(influxdb3): correct wal-snapshot-size example from 100MB to 100

Agent-Logs-Url: https://github.com/influxdata/docs-v2/sessions/b793da7d-0941-4a24-b8fd-ea0e9817ca3a

Co-authored-by: jstirnaman <212227+jstirnaman@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jstirnaman <212227+jstirnaman@users.noreply.github.com>

Author: Copilot

content/shared/influxdb3-admin/performance-tuning.md

@@ -530,7 +530,7 @@ Control memory pressure from write buffers:
 
 # Configure WAL rotation
 --wal-flush-interval=10s \
---wal-snapshot-size=100MB
+--wal-snapshot-size=100
 ```
 
 ## Advanced tuning options