Disk: Update Size value in example

[fullenw1]

This Pull Request (PR) fixes the following issues

A value with a size unit (like MB or GB) does not work. It generates the following error message:

Compilation errors occurred while processing configuration 'DscConfigurationName'. Please review the errors reported in error stream and modify your configuration code appropriately. CategoryInfo : InvalidOperation: (DscConfiguration:String) [], InvalidOperationException FullyQualifiedErrorId : FailToProcessConfiguration

Entering only a number works fine.

Task list

• [ ] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in README.md in the resource folder.
• [ ] Resource parameter descriptions added/updated in schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [x] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [ ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #215 into dev will not change coverage. The diff coverage is n/a.

@@        Coverage Diff         @@
##           dev   #215   +/-   ##
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  Coverage   95%    95%           
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  Files        7      7           
  Lines      980    980           
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  Hits       939    939           
  Misses      41     41

[PlagueHO]

Can you add an entry into the CHANGELOG.MD for this change?

[PlagueHO]

Closing because superseded by #218