Update LAB_AK_03_Lab1_Ex1_retention_policies.md

[awillslo]

removing ps parameter -PublicFolderLocation All as this causes the Policy to error out as we have no public folders.

Module: 00

Lab/Demo: 00

Fixes # .

Changes proposed in this pull request:

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[riswinto]

I've tested and approved this change. Thank you for bringing this to our attention.