Add changelog for plex/minio charts

charts/minio/1.2.1/CHANGELOG.md

+* TLS Support added for Minio application. This lets users to use TrueNAS certificates with Minio Application.
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charts/plex/1.3.0/CHANGELOG.md

+* Application liveness / readiness probes were updated addressing a bug where TrueNAS failed
+to consider plex application as `Active` if it was configured to only use `HTTPS`.
+
+* Nvidia GPU support was properly added which ensures users having NVIDIA gpu can now consume it
+for hardware acceleration.