Manifest Cleanup Compontent improvements

[Timo-Breumelhof]

Description of documentation change

• The Extension manifest Cleanup documentation does not have an example on how to remove a folder.
• Also the GLOB text is incorrect

Existing documentation URL (if applicable)

https://docs.dnncommunity.org/content/tutorials/extensions/dnn-manifest-schema/index.html#the-dnn-manifest-schema

Existing documentation section (if applicable)

Cleanup