Updated disk example with size in bytes without measurement unit

[fullenw1]

This Pull Request (PR) fixes the following issues

Fixes #214

Task list

• [x] 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.

---

This change is 

[codecov-io]

Codecov Report

Merging #218 into dev will not change coverage. The diff coverage is n/a.

@@        Coverage Diff         @@
##           dev   #218   +/-   ##
==================================
  Coverage   95%    95%           
==================================
  Files        7      7           
  Lines      985    985           
==================================
  Hits       943    943           
  Misses      42     42

[PlagueHO]

Sorry about the delay @fullenw1 - we've been a bit focused on the migration process over to the DSC Community. I've updated the build so that we can get this through.

[fullenw1]

Can you move this up to be in the ## Unreleased section and remove the duplicate ## 4.9.0.0 header?

Done :)